Galvin and Luai have played five games together, so it's not as if dropping Galvin is going to break an established partnership. Get Latu in there asap when he is fit and in the grand scheme of things not a lot of ground has been lost.
When we signed him, most people thought Latu was the best junior. Galvin was actually a surprise pick last year to start. From the small sample pieces we have seen, I don't think we are losing much, if anything. Plus from what we read today I think having Latu in the team will be a huge benefit regarding team harmony.