I think TPTB are just playing up on the fact that he had gambling woes, etc... Ryan would NEVER kill H. I think it's a set-up and Ryan is a part of it, just like when H asked him to be "undercover" for the whole "mole" thing in Season 4.
Also, remember that last scene in "Sunblock," where Ryan said to H, "You went to bat for me. I'm not gonna forget that." He was thanking H for helping him get reinstated, and in turn H asked him for a favor. I dont' think Ryan's "gone to the dark side," although that's obviously what TPTB are hoping people will think so they'll tune in in Sept. ... MAN I wish they'd just start the season in August!