Right. Here you see Mousasi charging forward with his head literally DOWN (a big no-no) while throwing basically push punches and he was able to land 2 of them to Machida's jaw. Machida, of course, fired off his left straight in the process and it missed the target and hit Mousasi's shoulder instead and a nothing right straight to the body. Machida also dropped his hands again after throwing that left and was wide open for more strikes to land (like a left hook from Mousasi as Machida was circling left and out, which he could've stepped in with). Machida panics when he's pressured and Weidman will not only pressure him, he'll do it intelligently and systematically break Lyoto down until he lands the finishing blow(s). Mousasi punches hard but he doesn't have Weidman's power or timing (this is coming from a Mousasi fan as well).
It isn't
as hard to successfully pressure Lyoto and make him make mistakes as you're suggesting it is. Thiago Silva, Bader and Evans are also inferior strikers compared to Weidman. All 3 have big power but their timing isn't nearly as good and their technique isn't either. Weidman's left hook (which he KO'd Anderson with and dropped Uriah Hall) isn't all that Lyoto will need to worry about in the standup. He has big power in both hands and doesn't need to rely on creating collisions to knock a fighter unconscious, or at the very least, drop them hard. Ask Anderson when he clinched with Weidman in their rematch and got floored with a short right hand to the ear. Weidman needed little space to accomplish that even from an awkward position and posture.