All of the DEs having been signed means almost nothing. Take last years 6th and 8th picks:
6. Vernon Gholston DE N.Y. Jets Signed 5 years, $50 million
8. Derrick Harvey DE Jacksonville Signed 5 years, $33.4 million
Same position, two picks apart, and the salaries are completely different. At the top of the first round, being a spot or two higher makes a considerable difference, regardless of position. I'm with you in hoping that Maybin gets in soon. But it doesn't have much to do with which DEs have signed.
And where are you getting that they guys before and after him have all signed? He's #11. The 8th, 9th, and 10th picks have not signed.