Rockets need to add more to the team?

They got Harden, Parsons, and Howard but need more. Who is gonna play PF? Asik wants out and doesn't want to play PF. Can Lin be their PG? I heard the Rockets are trying to trade Lin and Asik for another star. Who should the Rockets try to get? As of right now idk if this team can beat OKC or the Spurs.