Yeah I think he and Naismith are going to be exactly what you need from squad players, versatile and relatively consistent. I think a lot of why Jelavic looked better is he and Vic play too close together and are going for the same balls.
That is what we have been lacking for years so glad to finally have some PL quality players on the bench.
You are spot on with Vic and Jela. I think with time they can learn how to play with each other, but both are wanting to prove themselves and get goals. That is great and all, but they consistently get in each others' way b/c of that. 4-4-1-1 would suit them better so they would not be making the sam runs simultaneously.