Replace Coleman with speers or low prospect

Then this deal have no reason for Preds. We can change picks or Sissons, but not Coleman or Vatanen.

But the Devils take on 2 bad Contracts for one of the best contracts in the league with Coleman

Yeah if we're taking on 100% of both contracts, there's no shot you're getting Coleman. I'd be very willing to include a lower level prospect that still has an NHL future like Seney, which I think would be a pretty fair trade. I'd even retain salary on Vatanen in that case.

It isn't best contract in the league. Arvi(best imo), Rakell, Gallagher, MacKinnon contracts much better.
Yes Bonino and Subban contract isn't perfect, but right now they are not too bad(look at new EK, Hayes deals), that's truly terrible(and i am not saying about Lucic, Neal etc contracts).
Bonino one of the best 3rd line centers in NHL, mb best, but i think his optimal price 3,3m so it is only 800,000 less, than he already has.
PK should have +/- 7-8 millions, but look at new top right-hand defensmen contract's, it is more or something like that, than he already has.

Smith is on a good contract for a consistent 20+ goal scorer.