Tough call here. i might be in the minority here, but depending on how your TE position looks without Finley, i think id do this if you have another TE that wouldnt be a huge dropoff. If it leaves you with a hole at TE, then try something else. In a Dynasty league, Dez is too tempting to pass up, i think you could lock down a guy that could be a top tier WR after a couple years in the system. They threw to him a ton in his very first game. He has Austin to keep defenses honest.
Finley on the other hand is going to be a very solid TE, has a great offense, Floyd could end up being the next VJax in SD, but didnt show much in week 1 ( he did get about 10 targets, just only 3 catches). You're giving up alot of potential, but getting back even more imo. Usually the guy getting the single best player in a multi-player trade is getting the better deal.
thanks for the help on mine.