Your right it does depend on how one judges elite. You saying a 3 time Norris Trophy winner in Erik Karlsson wasn't an elite player player, when only 3 players in history of the league has won more, is a perfect example.
I mean Sweeney signed Ullmark who was certainly Elite the year he won the Vezina, at least in the regular season,and he did receive a return for linus looking towards the future. So that to date is probably his biggest/best move. So maybe using Elite was a bad choice of words, but the point being is Sweeney just hasn't been a guy to acquire, shall we call it a difference maker or a highly skilled player through a trade in his tenure and who's made an offensive impact on this team, imo.