So... it looks like I was wrong. Hendricks didn't gas. Looks like he worked on his cardio for the GSP fight. Hendricks' s wrestling was also pretty good. He was obviously physically stronger than GSP. He was able to turn GSP when they clinched against the fence. He also did good in the striking department. He was able to get his strikes off first in some of their exchanges, and he took some good shots that didn't look like they hurt him at all.
Ask in all, he did really well against GSP. He just want able to finish the fight and get the win. There was a moment in the post-fight press conference where Hendricks was talking about conserving his cardio and only hitting GSP with 70% of his power. Hendricks said that it was enough and Dana corrected him and said it obviously wasn't he didn't beat GSP.
GSP also looked off in this fight. He said his eye for messed up, and he didn't look his normal active self. He was able to take Hendricks down a few times, but he couldn't keep him down. GSP was able to land more strikes, he just didn't hurt Hendricks as much as Hendricks hurt him. It also sucks for GSP that he tends to cut easily, unlike Silva who has amazing skin and doesn't cut or bruise.
GSP for the win by split decision, but their are a lot of people that think Hendricks actually win that fight. Maybe I'd Hendricks had finished GSP when he had him get, he would be the new champion. I'm going with "if he could have, he would have, but he couldn't, so he didn't."