Grey Zabel at center could be a costly upgrade

Won't you learn your 'Gray Be C's?

The Seahawks plan to start first round pick Grey Zabel at guard, but if he ends up moving to center it could actually cost Seattle an entire year of their contractual rights with him.

• Zabel is most valuable as a tackle, which nobody thinks is probable

• Next-most valuable as a guard, which is where the Seahawks will start him as a rookie and hope to keep h…