The thing is, Setu isn't versatile. He can only play in the backrow. McGuire on the other hand can play both front and back row making him the more versatile player.
I believe our forward pack is quite competant despite struggling with consistensy and leadership. The only weak link I believe is our hooking position which has been rendered useless by the talent of Gorrell, expired form of Marsh and inexperience of McCullough. There's no doubt in my mind though that McCullough will blossom into a represenative hooker, we just need to be patient and watch him develop in a position he's only been playing for a year.