Yeah, he can punch his weight!

In all seriousness though, you don't want 1 dimensional sparring. A more relevant sparring partner like Wach is great, but Wider brings what Haye needs to be sharp and conditioned to adversity.

Wach for the tactics and Wider so that weathering Fury's lummexing, clubbing attack feels like a stroll by comparisson.

Wach will be tuning Haye's sights to get in and hit his target, Wider will be likely used to sharpen his defence.