I agree, I think Urlacher is more hybrid defender (Rover, Sniper, big Nickel, etc.) than he is a S.
McClain seems like "the guy" right now. Seems like he's the top "realistic" target at the present. Maybe that changes after visits but him and Gallegos do seem to be the best realistic targets right now.
Where I disagree, is I'd be prepared to take 4-5 S's this cycle. They simply cannot miss on numbers or talent this cycle. They need to start over recruiting the position so they have more options. And, S's offer a lot of position flex and ST's value depending on the types of athletes you bring in.