If the specter of losing Amari wasn't out there I'd be perfectly fine tagging Dak and making him prove it.
If we do end up losing Amari then it's on the team for not pushing hard enough, and on Dak for being a greedy fuck and cutting off his nose to spite his face. Is losing your number 1 WR really worth an extra $2-3 million/year when you're already making $30+/year, with over $100 guaranteed, and God only knows how much in endorsements on top of that?
If we could've tagged Amari and flipped him for a late 1/early 2 I'd have been perfectly content to draft Ruggs at 17 and using Amari's cap space elsewhere in FA. As it is it'd burn to lose Amari for nothing and then having to burn another 1 on a WR.