He couldn't even stun Chisora. Injury? Well that was his left arm. I'm sure his right is stronger and landed flush plenty.
Haye battered Chisora. Vitali has also been talking smack about Haye. Doesn't matter who started it. Just bloody fight, don't use excuses and say he'd easily beat him. If its so easy, why not make the fight to earn the 'easiest' money and the most money you could from one single fight.
This is why Klitschko's don't get respect.