Chisora breathes hard enough on Grant's chin and it's over quickly. Michael Grant was a hype job of the highest order.
Chisora has lost to worse guys and Grant showed enough power and heart against more skilled fighters to be favored here. He stops Chisora
Depends on Grant keeping his cool. He could hammer Chisora with basic boxing like he did against Izon, but could he maintain it without making a mistake and getting clipped? I think it would be close, but definitely end by stoppage.
Grant hasn't stopped a lot of far less durable guys than Chisora. Ray Anis, who was demolished by John Ruiz in few seconds, Jeff Wooden, Savarese, Danny Wofford, Lionel Butler, Marinaccio, McGhee and others. And the only durable guy whom he has stopped in his whole career was Alfred Cole, whom he never came close of hurting in 10 rounds and stopped only on cuts. What does make you think he stop Chisora (other than yiu being a fan boy of Lennox Lewis)?
Heavy hands, basic boxing, uses his size to smother and good workrate. Grant isn't very good but he has enough for Chisora
It's hard to say who would have won. Chisora is very beatable, but there's one big difference between them: Chisora can take a punch. Grant can't. Both Golota and McCline dropped Grant hard with the very first power punch they landed. Even mediocre Dominic Guinn completely obliterated Grant and brutally knocked him out. I don't think that Chisora is far lesser puncher than Guinn. Therefore Grant better has to avoid Chisora's attacks and try to outbox him from the outside. Though Grant wasn't a skilled fighter, he could box a bit and I think that prime version of Grant could get the win if Chisora fails to connect cleanly.