I don't think the cost of 3 firsts, if that's what it is, is an issue. You could probably go back 10 years and pick the best 3 first round picks we have made in that time span, and a player of Watson's caliber would be a steal for those players. If a deal could be made with some kind of pick protections in place conditional on Watson's legal status, you really gotta strongly consider it.
Personally, I'd rather wait until after the season so we can better see what we have in Tua and have a better idea of where things stand legally for Watson.