That fight was really weird. Maia looked gassed in the first round (Weidman didn't look much better though). His punches were sloppy and as someone mentioned looked worse than in some of his previous fights.
Wasn't there an interview lately where Maia said that he would return to his roots what initially brought him his success in the UFC and would focus again on his BJJ¿
There are quite some BJJ fighters that, to my taste, fell too much in love with their boxing (i.e. the Nogueiras). Maia probably is in a fringe zone between boxing and BJJ. By focussing too much on his boxing, those new boxing reflexes interfere with his BJJ so that he lost some of his skills there, but he didn't box long enough that his boxing can compete with longtime strikers. Maybe he learns to use his boxing to set up his BJJ instead of trying to pretend to be a striker.
Using his BJJ to stand up was really a WTF-moment. He had his opponent almost reversed and could have attacked on the ground, but no he stands up and returns to sloppy punches.