One thing about Poole is that he's young - he turns 18 in June, a year later than some other guys. And his body is still developing and looks totally different than a year ago. Whether or not it's next year, he's got a great chance to be really good at UM.
As for MAAR, he's done a good job and his success is a testament to him and JB. But I wouldn't call him a good 3 point shooter as a guard/wing at Michigan. He and DJ had essentially the same 3pt numbers, tying for 5th in 3pt made and 4th in 3 pt % (5th if you include Donnal). He's good in that he only takes wide open threes and hits them at a decent clip. But he's limited - no 3s off the dribble or around screens or against tough contests - and even in his limited role isn't a dead eye shooter.
And while he shot well in B1G play, his shooting overall in "games that matter" wasn't great. He shot 4 for his last 16, 27% in the NCAA tourney, and 33% in the B1G tourney. In the nonconference, he shot 5-22 (23%) against Marquette, SMU, SC, VATech. Texas, UCLA, and Furman and 9-24 (38%) against the tomato cans. Even in B1G play he made 0 3s in five games and 1 in another 5 -- so over half the games he made 0 or 1 3pt - as the 4th or 5th guy on the scouting report. He wasn't getting as many shots as others, but when he occasionally did shoot off the dribble or contested 3s, it seemed evident why. He was also quite poor at 2pt jumpers.
MAAR played an important role on this team and last year's too. Especially once Walton took over, he was an excellent complement, hitting shots and leaking out for fast break opportunities. He played pretty good defense, sometimes really good. He's solid and I hope shows I'm wrong about his limitations. And he may play 30+ minutes next year. But I think he gets pushed more than this year, and there's a better chance than some think that Poole or others eat into his minutes if he doesn't bring it.