No way... GPS vs Maia would be a one sided jab fest with Maia's face looking like everyone else that GSP fights. He's got no explosiveness to him and GSP has insane TDD and gets up when taken down very quickly. Pretty much everyone GSP has faced have been wrestlers and BJJ practitioners, no one has an answer for his athleticism... Certainly not Maia.
Koscheck has a longer reach than Damian and he got checked into the jab clinic twice.