Here is a draft analysis video of Mike Gesicki against Michigan. What I encourage you to look at is his blocking. While it is not good, it is being commented on as if it is non-existant or as if he simply has no ability to block. I noted 8 attempted blocks in the run game and 1 in the passing game in this clip. In this video Gesicki was successful in 5 of his 8 run blocks, with his lack of success being attributable to lack of effort IMHO. He was successful in his one pass protection.
My belief is that Gesicki's lack of run blocking prowess stems from a lack of urgency. The closer he is to the play, the better he blocks. When the play is designed to go away from him, he does not put in as much effort, leading to his man easily disengaging, and sometimes making the play after shedding the block. I contend that with proper coaching, he will understand the need to have that urgency, and with practice he will become a much improved blocker in the run game. He already has the ability and more desire in pass protection.
Here are the times of the blocks:
0:19, 0:42, 2:21, 2:37, 3:08 & 3:18 better angle replay, 3:59, 4:22, 5:02. The good blocks are in Aqua and the bad blocks are in Orange.
There are also a couple of highlight catches by Gesicki at 0:35 and 3:03 and he jumps over his QB in celebration at 3:17 if you are interested.