if all he needed was a body dead off island then brought back, shit then he could've had anyone on that island do it. I mean it seems pretty simple to manipulate anyone on that damn island when you are the smoke monster that can appear as anyone that is dead.
yeah, but the problem is that they're trapped on the island. so you can manipulate them however they want, but they have to get off the island (a feat that has been exceedingly difficult) to get the dead body and then bring it back. to an island that can't be found. smoke monster doesn't appear as anyone that's dead - it appears either as the monster or in the body of locke or christian or man in black, that's all we've seen. and we know specifically that they died off the island and were brought there.