I think it's a little early to say Overeem needs to retire. In the past 2 years he has beat Hunt, Werdum, Arlovski, and JDS. Only losing to Stipe and Ngannou. That was definitely a scary moment though. I said, "Oh shit! He's gotta be dead!" after that huge uppercut. He's always had a suspect chin and like 60 pro fights. I don't see him retiring on his own accord, especially with wins over the divisions top guys. He should probably fight Cain or Derek Lewis next to gauge if it's worth it to continue fighting in the UFC or not. He'll almost undoubtedly go to Bellator after his run with the UFC is up though.
Ngannou is a fucking problem for Stipe who likes to have fire fights with his opponents. It'll be interesting to see how the HW division develops from here.
Holloway did an awesome job.
Alvarez put himself back in the mix again beating an 18-0 Gaethje. He has gotta have a fractured maxillary or however it's spelled though. Dude goes in there and gets jabbed it seems and he's 15 rounds deep vs. Dempsey right before WW1.