Anderson hits pretty hard, but it's all about accuracy for him. I don't think he hits harder than Vitor or Weidman in his weight class, and P4P not harder than Carwin or Fedor (p.s. several guys, including Hendo, say Fedor hit like a truck, so he should be on here.)
Hendricks doesn't actually have that many KO's. Not sure he hits even harder than Robbie. P4P a guy like Cub Swanson might hit harder.
P4P, Dodson definitely hits harder than Aldo.
Rampage used to hit very hard.
Those are just off the top of my head. TBH, I think your list needs a lot of work.