I would watch Sissons a bit. I mean, he has been a great unheralded warrior for the Preds for several seasons, but something is off so far this one. I don't see the Preds having any interest whatsoever in Henrique though if they do make a move with Sissons. That's a non-starter.
The Preds won't take Dermott, period, they have filler D already. If retention is on the table it will cost... at least pushing the pick value to the 2nd rounder level, but frankly I don't know if you will need retention if you make the trade later in the year? Just take Fabbro straight up for some esoteric Euro prospect or some guy in Bakersfield who might help Milwaukee win a Championship who still isn't really a significant NHL prospect? The Preds have no use for filler guys or picks below the 2nd round.