I think he could very possibly beat Silva. Silva at -200 in that one.
Okami takes very little chances on the ground and doesn't get submitted. His wrestling is strong and Silva has been on his back many times but usually gets a submission. Against a cautious fighter like Okami, that spells a ton of trouble. I'm all over Okami in that matchup.
I would have agreed with you 100% until Dana said Okami is getting a title shot a few days ago. They didn't even show his last fight because of how boring it is but he's still one of the top guys at his weight and Silva needs this test. It's going to be a nightmare if Okami takes it but I feel he likely will.