Who cares how many rounds the second Sonnen fight was, he got his ass whooped in that second round, turtled up and was brutally finished. That's really all that matters.
You shouldn't ever, EVER get a title shot coming off a loss, unless it's under completely ridiculous and desperate circumstances (i.e. Jones not having a suitable replacement for 151).
There is absolutely no way Sonnen deserves a shot at Jones more than Vitor at this point. I'm sorry, but it's the truth, you don't get a shot at the title after getting destroyed in your last fight (which was also for a shot at the gold). Simple as that.