What is even more limited than GSPs offensive boxing is his defensive boxing. That's what would make the difference vs Woodley.
But as I have stated several times on Sherdog, GSP relies on building off of his jab. If he can't establish a jab and the TD threat is gone, any dangerous striker would light him up.
He struggled once his jab and TD were taken away vs Johny. A much less skilled striker was outstriking GSP and even establishing his own jab even though Johny's jab is one of his worst aspects being a left centered southpaw, unlike Diaz who is a jab centered southpaw. He struggled to fight outside of his bread and butter, once Johny slowed he went back to what he knows.
Most of his defensive tactics are to shoot a TD or clinch up and he tends to reach for the clinch leaving him very open for shots.
Woodley actually has the ability to adjust and adapt mid fight without his corner telling him so. GSP almost lacks that ability almost entirely mostly because he comes from such a gameplan centered camp for years he always relied on it.
In my opinion, Woodley would catch him. He is faster and hits much harder than Bisping who was landing often on GSP before he used the TD threat to land a big left hook. It would only be a matter of time until he caught GSP with something heavy.
People like you don't like to admit it but GSP has fought mostly 1 dimensional fighters or fighters with very glaring holes in their game. That's 90% of his entire career. You probably think he has been clean his whole career too huh?