I read an interesting preview from a Lincoln Fan I think, where he actually had Nuttal down as a key signing and said that Cowley had eyed him up a target-man option a couple of years prior. We definiltely need someone with a bit more strength if Smith is out, I haven't given up on Korboa and Warburton but they don't work together as a pair.
I like Korboa but Warburton is just not quick or strong enough for a striker at L1 level.