Much lesser challenge. People forget but Jon Jones has GREAT wrestling and has out wrestled wrestlers and has taken down Lyoto Machida like a ragdoll. He also makes BIG LHW looks like a weight class lower.
Chael Sonnen hasnt had time yet to bulk up and then cut down to 205 for weigh ins and then bulk back up before the fight like you would normally do. Chael Sonnen would have cut little water weight or maybe a bit of fat to make weight. He then would basically put nothing back on for the fight. So Jon Jones would have been able to physically rag doll Chael.
Chael also has no chance to knock Jones out, no chance to Submit Jones, their wrestling would be even seeing as how Jones would have the physical advantage, and Chaels cardio wouldnt be up to par for a 5 round fight. Maybe in a 3 round fight Chael would have a better chance but in a 5 round fight Chael has no chance. He would get tkoed as soon as his shots start failing.
Dan Henderson on the other hand you can NEVER count out and could knock out a horse with his H bomb. And Dan Henderson is a great wrestler himself. And even a tired Henderson can knock anyone in the division out if he lands clean.
Chael should have been an easy fight for Jones.