Kidd was the lone player absent for the team meeting, after which players depart for the offseason. Dallas became the first No. 2 seed in NBA history to lose a first-round best-of-7 series when they lost Game 6 against the San Antonio Spurs on Thursday night.
"No, it's not surprising," Carlisle said of Kidd's absence. "Look, he's gone. He went back to Phoenix, I think to get away from it and do some personal things, and so I got no problem with that."
Kidd, 37, struggled through a subpar series, averaging 8.0 points on 30.4 percent shooting and 7.0 assists. He was never able to put his stamp on the series and he was outplayed by the Spurs' two point guards of Tony Parker and George Hill.
Word began to leak out after Game 6 that Kidd had the flu to start the series and that he physically wasn't at his best. Kidd finished Thursday night's game with just three points and six assists. He did not talk to reporters after Games 5 and 6.
"He may well have been affected," Carlisle said. "He would not want to use anything as an excuse, I know that. But when you get into a series that is played at such a high level, every ounce of energy you can muster is always going to help.
"Again, he poured his heart into this thing, really since I've walked in the door here and been involved."
Kidd completed his 16th NBA season and the first of a three-year contract worth $25 million. Acquired in a blockbuster trade in February 2008, Kidd is 1-3 in playoff series with the Mavs.