Yeah lots I agree with here. I'd be ok with keeping Kmet if he's open to a restructure - it's not for nothing that he knows the system, is still shockingly young, blocks well, etc. You're gonna need to replace him with someone and Smythe I don't think can play that role.
I also agree on RB. Swift had a great year but I dunno how much you can expect him to keep it up - I'd love to draft someone that can be a lead back. Monangai rocks but I just don't think he has the size or versatility to be that guy.