There isn't a big difference in pick 16 and 19 so the trade was pick 10 and a 12 pick downgrade from a 2nd rounder (essentially equivalent to a late 3rd rounder) so the trade was just pick 10 like I said.It was 10 + 16 + 73 + F2 for Gibbs + 77 + F2 + F3.
The Future picks in 2018 were 19 and 37 from Carlton and 25 from the Crows (before compensation, and Academy/FS bids).
You didn't just downgrade 16 by 5 picks.
Its a clear two first rounders give up.