I think this whole Earl to CB in the nickel thing is pretty interesting but I doubt it actually happens. It'd be nice to find a player with a similar skillset to Earl, later in the draft, probably a rawer prospect but someone with the ability to play centerfield back there. I think Cooper Taylor would make an interesting addition to the secondary as Earl's backup. The same way the FO wants to find a player similar to Russell to be his backup, they might want to take the same approach with Earl. As it stands, the Seahawks would take a little bit of a hit if Earl went down. You're down an All-Pro and a leader. So his replacement, while not as skilled, would need to have to have similar qualities.
Taylor is that guy to me. You see him at 6'4" 229 and you think strong safety big hitter type but he's not that type of player in my mind, after seeing a few "Bigfoot" quality videos of him. He looks more like a fast, rangy ballhawk than vicious thumper. Not only would he be an excellent backup but odds are he'd be an amazing special teamer as well. Maragos would get the boot but I'd love a secondary of Thomas/Chancellor/Johnson/Taylor/Guy. Who knows, maybe he ends up competing with Kam for his job. He mitt be versatile enough. He's certainly athletic enough.
Add to that that you'd have the "Atari Bigby" role filled as well as have a shot at taking advantage of Earl's versatility by moving him around a bit more and you've got a GREAT prospect in Cooper Taylor, in my humble opinion.