I don't think Usher's begging for anything at all, he's just making music and being friendly. Remember, Usher made a comment about Chris Brown too when he was with Jermaine Dupri in 2009, but he apologized later on as it wasn't his place to make the comment of "C'mon Chris, have some remorse." I'd look up the video, but I'm on my phone...
Also, I actually won't blame Chris regarding any of this. It's clear neither of them are very close, and both are pretty much just making music together finally to get some buzz going in both of their cases. Only Team Breezy would say otherwise, but Chris has no place in mainstream music. "Look At Me Now", "Loyal" (both being pushed by features and urban radio **** riding his as usual) and his EDM stuff went top 10 since his Rihanna tragedy.
Chris got screwed by many after the Rihanna thing, so I don't blame him saying he only trusts very few people in the industry and I get that. Also he was a teenager, like 17-18 when he made those comments in 2007-2008. I highly doubt Usher gives a damn about what he said back then and what he thinks now, he just wants to make music and get back to the top.
I do dislike how a lot of R&B artists get high and mighty and forget Usher and his contributions once they have a few hits.