Nothing is new
He'll absolutely be back once Grandma dies. Jane will get her cut of the inheritance and confiscate Jason's and David will ride off into the sunset. It's a shame in a way because there's no way that any of the money that Jane gets/takes will ever end up with Jason, she'll probably spend it all on alcohol and moustache combs for Harvey. He could've done with a couple years on 10k a day so he can put some money aside.
Also, has anyone been following what's going on with Emma? Seems like she's back on smack again and her boyfriend stole what little money she has.