Who/what can you trade Head for and why is he/it more useful to Rockets than Head?

I can't find a guy that earns 2m per year less usefull than Head .

 

Huh? Anyway...I think the main thing is to package Head with another player if possible to get one player back that would be more useful to us in whatever position, than the outgoing Head and whatever other player; if that at all becomes possible. I don't think anyone really expects to trade Head, or any other Rocket straight up for a better player.