Faagutu spent much of the preseason with Kepaoa in the opposed side training at backrow so would assume he is the next option up. However he is recovering from a minor injury. I would much rather see Faagutu in the middle, hes much more suited to a 13 or even a smaller 10 at a pinch (play style much like a Cotter or Murray).
On Faagutu, I believe he is the most underrated of the juniors coming through. Galvin and Da Silva have a higher ceiling/potential but I think he is the safest bet in terms of fulfilling his potential, due to his attitude and work ethic. While developing these Wests juniors is the absolute priority at the moment, I hope we dont forget about the ability of some of these other junior stars that we have in the system.
On a side note, would personally like to see Samuela play in the backrow as i believe that is his best position. He would be a nightmare running at opposition halves with his size and strength.