His strength makes the difference but if you're also a great grappler you can gas him. he's gonna get you though.
If youre a good grappler you can keep him on his feet where hes weak you saw it a lil in the final round and you saw it against Gilbert Burns which they references a few times....DDP stylisitcally is a good fight for Chimaev.He will look dominant against guys who cant wrestle...