I feel like he'll definitely be a contributor. He showed his defensive presence. Even if he wasn't stealing the ball, he was trying to press and rush the the opponents passes. He showed some offense as well with some slashing to the basket and hitting a three.
Gessel showed he is the starting pg. He looked very comfortable in the role. He wanted the ball and he did things with it. Whether it was passing or scoring, he didn't look overwhelmed.
I don't have any idea how many minutes Clemmons will get. Fran was changing out players every few minutes and wasn't using a real rotation. I wouldn't be surprised to see Clemmons getting some quality minutes off the bench though, he was effective.