1st round Centers are beneficiaries in that sense, because the options and tags work for OL as a whole, and C are least paid. So, the tag/5th year option for the C is the same as for OT, even though they are worth a lot less on open market. So, Ravens did the right thing not to pick up the option. They will try very hard to get an extension. I do hope they fail and we will get make a play for him.
That's my best scenario. If they really are going QB in the draft it would be a bad idea to also have a rookie center.