It doesn't sound like much incentive at all, actually? Stamkos is owed $22.5M remaining, and 2/3rds of that on a buyout is $15M, so giving us $13M back in utterly useless player contracts isn't noticeably better than a buyout. For all that Stamkos is overpaid and overutilized by the current coach, he's still a useful player overall.
Again, the Preds won't take any negative value back for Stamkos. Zero value? Well, I would, but Trotz certainly wouldn't. So making these offers of contract dumps and whatnot is just a waste of your time even proposing it. It's not happening. Even me saying I'd give him and his whole contract away for free is a waste of my time too, because even THAT is not happening.