You know how almost every spread you see looks the same and ducks seem to wise up to them pretty quick. Why not try a spread with a bunch of divers in it. If you can have a natural looking spread that doesn't look like a photo copy of everyone else's than go for it. We don't shoot a lot of divers but we always have divers in our spreads to diversify it from everyone else.
I'm all for having a menagerie of different decoy species in my spread. It's not uncommon for us to have mallards, pintail, ringnecks, redheads, buffleheads, and canada geese all in the same spread. It's paid off more times than it has failed.