My line of thought is not to redshirt him, but rather redshirt Whitt. Keller is used to competition (obviously at ASU) and we need a strong backup in case something happens to him (I don't particularly think Ganz or Davis are great prospects for backup).
What I hope to see is Keller step in and have a great year next year with Lee getting some reps in blowouts. Lee step in after that for two years, and then have a young guy take over the reigns for a 3-4 year span of time.