Both players emerged from high school as top-60 recruits. Prater was the No. 9 wideout in the 2010 class according to ESPN Recruiting Nation; Arnett was the No. 9 wideout in the 2011 class. Both grew up in the Midwest but both elected to play for famous, faraway programs -- Prater at USC, Arnett at Tennessee -- that had produced great wide receivers over the years.
Then, in January 2012, both elected to transfer closer to home. Arnett, from Saginaw, Mich., transferred to Michigan State to be near his father, William, awaiting a kidney transplant. Prater, from Maywood, Ill., transferred to Northwestern and also cited family reasons, although he hasn't gone into detail.
Both fanbases celebrated the arrivals. The good vibes continued when the NCAA ruled that both Arnett and Prater could play immediately because of the circumstances that sparked their transfers. Each had three years of eligibility left.
Although their situations weren't ideal, both wideouts appeared to be back on track.
But they had more detours ahead. They have combined for only 23 receptions and no touchdowns the past two seasons. Prater dealt with a "plethora" of lower-body injuries that limited his effectiveness. Arnett took longer than expected to adjust to the offense and slipped down the depth chart as other receivers emerged.
Fans didn't forget them, but the buzz that existed when they arrived practically disappeared.
Prater and Arnett are still around and, after strong performances during spring practice, both could finally make the impact many expected two years ago.
"I'm looking forward to great things happening this year," Prater told ESPN.com. "I can honestly say I feel like I'm back, and I’m ready to go."
Added Arnett: "I had a big spring, so I’m continuing to build on that."
Both receivers drew high marks from their coaches during the spring, as they put themselves in the two-deep heading into the summer.
Prater's chief challenge was making it through the 15 practices intact, which he did. Despite a 6-foot-5, 225-pound frame, Prater hasn't been structurally sound during his college career. Injuries limited him at USC, where he had only one catch in two seasons, and have continued at Northwestern, where he recorded 10 receptions in 2012 and nine last season.
"You could not put together a worse script from an injury standpoint for a person," Northwestern coach Pat Fitzgerald said. "It's been such a bad deal for him."
Prater hasn't had one single major injury, but several issues "built up to a degree where I couldn't perform where I wanted to." He thinks many of the issues could have been prevented with the right stretching or training regimen.
When Northwestern's training room opens at the ungodly time of 5:45 a.m., he's often the first one through the door. He has improved his flexibility and tried to lower his hips to create more explosion out of breaks.
"It's just being proactive," he said. "Like if it’s a hamstring, I'm going to do the things to not have [an injury], strengthening my glutes, all the areas around there."
Arnett also has worked on his body, adding 18 pounds last season, when he appeared in just one game -- the opener against Western Michigan -- and had only one reception. But his challenge has been grasping the system and competing for time in a Michigan State receiving corps that improved significantly after the 2012 season. Dantonio said late in the 2012 season that he wished he had redshirted Arnett, who played as a true freshman at Tennessee and had 24 receptions.
This spring, Dantonio called Arnett the team's "most pleasant surprise" and noted his consistency, aggressiveness and run-after-catch ability. The suspension of Macgarrett Kings created more opportunities for Arnett, who had five receptions for 63 years during a mid-spring scrimmage.
"It's given me a chance to, I don't know, re-state myself," Arnett said. "I feel more comfortable knowing everything, knowing all the positions, about where to go on the field. Now it's making plays."
Arnett is more relaxed, and his time on the sideline last season, while not what he hoped, allowed him to absorb the playbook. After a diet of pasta, steak, rice and iron -- the kind you find in the weight room -- Arnett expects to play this season between 190-195 pounds.
"I don't think just because I haven't been playing, the expectations should be lower," he said. "I want them to be high. I want to be in the situation where there's a lot of pressure on me to produce."
Fitzgerald called Prater "outstanding" this spring, and Prater thinks he surprised the coaches with his play. His next goal: silencing his doubters when the season begins.
"There's always a lot of naysayers, lot of people felt I didn't have it," he said. "They thought I wasn't there anymore, but I never stopped believing."
There were days when Prater wondered about all the injuries, why they kept happening, and whether he had a future in football. He admits the accolades he had coming out of high school overwhelmed him.
The last few years have brought growth and perspective.
"I look at the game as far as being more appreciative, having fun and being blessed that I'm out there," Prater said. "My whole career has been overcoming adversity. It shows a true test of my will that [I can] talk to you today and say I'm still here. I'm very confident in my ability to play. Everything I've been through has made me who I am now.
"This is the best I've ever felt, and I look forward to great things."
There are no guarantees for either Prater or Arnett this season, as both play on teams with multiple returning starters at receiver.
But if called upon, they'll be ready to finish their roundabout routes the right way.