The issue with Tyreke Evans is that he has never truly found what his best position is. He's played point guard, shooting guard, and small forward. Now that's a bonus and a reason why I would bring him back on a team friendly contract. Utility players like him and Garrett Temple are very useful on a team because they can cover multiple positions and give the coach a number of line up options. That said, I wouldn't re-sign Tyreke to be our starting point guard, nor would I re-sign him to an expensive contract. If it's a team friendly deal and he can fit into the rotation off the bench, I would happily welcome him back.
As for Darren Collison, he is someone I would have tried to trade, but in this case I would let him walk. His career assist average is 4.8. His career high is 5.7 (as a rookie) and this year with us he's average just over four per game. Now that might not be his fault, it could very well be the system and how he has been used. However, he has not really shown that he is a true primary ball handler. I like him as an impact player off the bench, but as the primary ball handler I would not want to retain Collison. He can score when he's at his best, but his play making is pretty average.
So with that in mind, I would re-sign Ty Lawson to be our starting point guard. From being a rookie until the 2014-15 season, he improved each season and at times was a borderline all star point guard. His stats in Denver:
AST: 3.1, 4.7, 6.6, 6.9, 8.8, 9.6
PTS: 8.3, 11.7, 16.4, 16.7, 17.6, 15.2
Those stats show his assists going up each year and his scoring got better except for that last season when it dipped a little. So Lawson is a player that can distribute and score, that is an excellent combination. He might not be the long term option for this team, and if we can acquire someone in the draft that can developed into the long term starting point guard, then having Lawson around will help the team competitively. Is it hard to trust him? Perhaps, but despite going off the rails last season, this season he has managed to turn his career around. His numbers are a bit down but he's shown signs he could be regaining his form and if he can return to his Denver form then he's an upgrade on Evans and Collison. So for me as long as the price is right I would bring him back.