One of the least heralded engines of the Chicago Bears' run to the Super Bowl in 2006 was a pair of well-matched defensive tackles. Tommie Harris was the quick playmaker who had five sacks in 12 games. Tank Johnson was a 315-pound run-stuffer who kept centers and guards away from linebacker Brian Urlacher.
Veteran Anthony Adams was sidelined by a minor injury and could ultimately supplant Toeaina, and it's also possible that rookie Stephen Paea could work his way into the rotation. But based on recent personnel moves, and the lack thereof, it seems clear the Bears are counting on Melton to provide the interior disruption at the so-called "under tackle" position that is considered a fundamental building block of the Bears' scheme.
Fans who follow the Bears closely know that Melton flashed a few signs of promise at the end of last season, collecting 2 1/2 sacks over the final two months of the season, but no one can credibly stand up and say he is indisputably ready to take on a such a critical role on the defense.
"I'm just trying to establish myself right now," Melton said. "It's time for me to go out there and prove something."
Melton's relative inexperience at the position is stunning. He began his college career at Texas as a 280-pound running back, scoring 16 touchdowns during his first two seasons. He transitioned to defensive end midway through his career, actually losing 15 pounds to meet the program's size requirements, and didn't become a defensive starter until his senior year.
The Bears made him a fourth-round draft choice in 2009, and after a year on injured reserve, Melton played in 16 games last season as a reserve defensive end and occasional inside pass-rusher.
Is that the type of pedigree a Tampa-2 defense should be looking for in its under tackle? It's true that you can't have a proven veteran at every position, and the Bears can put All-Pro defensive Julius Peppers next to him. But they are without question taking a leap of faith with a player of unique athletic background but little seasoning at the position.
When I asked Peppers how he thought the Bears line was shaping up this summer, his answer was revealing.
"It hasn't shaped up," Peppers said. "It's still early. When we make the final team and see who we've got, we'll see what our expectations are. Right now it's kind of up in the air."
I don't think Peppers was implying the Bears will seek a new lineup via free agency or trades later this summer. He just put words to what is obvious: It's impossible to know if Melton is ready to take on this job. But the Bears have been talking up his candidacy for months, so I expect them to give him a long leash as the season begins.
To wit: In March, general manager Jerry Angelo said: "We feel, physically speaking, he's got everything you want in terms of size, speed, toughness. That's not any question. Now it's just a matter of learning the position and that will come with the repetition of more play."
To prepare for the role, Melton gained nearly 30 pounds and is now 295. He said the footwork he learned as a running back will help him because "you've got to position your feet around your opponent before you start using your hands" and suggested it is just a matter of time before he locks down the position.
"It's really just repetitions," he said. "You've got to really get in your groove. Once you get things going, the game really starts slowing down for you."