The player to suffer most from Reddish’s entry into the rotation could be rookie shooting guard Quentin Grimes, who has become a staple the past month after being taken in the first round. But the Knicks also believe Reddish can play some power forward in a small-ball alignment. That could also affect 2020 lottery pick Obi Toppin. It took some time for Grimes to earn Thibodeau’s trust and now he’s got it. “Just probably getting him indoctrinated into the NBA,’’ Thibodeau said. “We always knew these are things we like about him in the draft. His defense is special. He can guard four positions really well. His shot profile is terrific. He takes the right shot.’’