After the draft and signing Mayowa and Irvin I think we may be out on Clowney and Yannick. And, I don't necessarily think that's a bad thing.
Clowney is a great DE, but not a great fit for Pete's defense. He doesn't have the speed off the edge to play the LEO role and is not stout enough for the strong side end in Pete's traditional 4-3 under front (which in Pete's system is often in a 4 or 4i alignment). His combination of strength and speed did bring flexibility to the DL ("We want to be multiple," said every d coordinator ever). Clowney is an incredibly versatile player.
With the Texans he was effective as a 3-4 outside LB and 3-4 end. Although, I think neither was an ideal fit. With Seattle, Clowney was effective as a weak side end in a 4-3 under and a strong side end in a 4-3 over. With Clowney in the game the Seahawks were able to switch seamlessly between a 4-3 under and 4-3 over without sacrificing run strength to the strong side. But, I do think the lack of a true LEO was an issue and part of the reason the pass rush was mostly ineffective. It is telling that Mayowa and the 2nd round pick are in the mold of that LEO position, that may also be Robinson's best fit.
I think the best fit for Clowney would be the NY Giants. New d-coordinator Graham seems to want to run multiple schemes with the same personnel. He has hinted at switching between 3-4 and 4-3 depending on the opponent. I don't get the Titans fit.
Yannick would cost too much and block the other acquisitions. I don't like drafting a guy relatively early and then blocking his best fit role by trading for and signing to a long term big contract another guy with the same position fit.