Actually we know Detroit was in on Trouba through the aborted trade, and at least one other cap floor team was as well due to the waiver threat and Trouba not wanting to relocate to Columbus.
14m AAV, but several million less in real dollars. For a team that had well over 30m in cap space, and only two significant players to re-sign this summer, plus another nearly 30m coming off the books in the next two years, that's nothing. Gudas will likely be gone by TDL, Gibson possibly too, which would all but cancel out the $.
Not sure anyone would consider Vaaks, Terrance, nor a 4th rounder to be significant assets either. 2 guys unlikely to be on the team going forward, and it's not like you're gonna flip a 4th into an impact player.