So realistically, what do you think he brings in as a return?
Honestly? Hard to say. I don't think the OP is
that far off. Does it address Tampa (or their fans) needs/wants of a top 4D? No. Is there a certain value there with pieces that can and do both help their team, address needs, and provide legitimate value? Yes.
Rust/Sundqvist, Fehr, Pouloit and a 1st for TJ and a 3rd isn't bad value. And to an extent, I think TB fans are underrating some of those pieces; and more specifically the value GMs would place on them.
On the other hand I do not see why Yzerman would move TJ for "value" unless he's either A) getting back something he specifically wants (whether that's depth like the OP proposed or a key player such as a top 4D) or B) has external pressure forcing his hand (cap/budget issues, etc). And even then I think people are overlooking how hard it is to find quality center depth (there were a few posts about how TB could just go sign someone). There's a reason why PIT fans are pretty interested in this discussion. Skilled 2/3 centers - especially young ones are hard to find.
I know I'm not the GM (or a GM), but if it was me, I wouldn't trade someone as valueable as TJ if I wasn't getting a young D who I at least believed could be a top 4D in the near future (say 2 seasons) in return. And while I think DP holds more value then most PIT fans think, just on our board alone there's enough doubt about DP and what his odds of success (top 4D) will be that it's not a surprise that other fans are not all that enthusiastic about him as a key piece to the OPs proposal.