TJ was insanely efficient in this match, only expending energy when he needed to. He didn't waste a single calorie. It was awesome to watch, reminds me of Frank Shamrock in his prime in a way.
Barao wasn't any more 'off' than he was the first time, he just didn't adjust at all. He must have really thought he lost the first match because of a 'fluke punch' (his words). A shorter gas tank maybe, but that's going to be the case for everyone from now on.
I expect the same thing to happen with Conor vs Aldo. Unfortunately so do most people, so he's not the underdog like TJ was the first time