To be quite honest, I think Kucherov has more value than Stamkos and is likely on par with Tavares (but Tavares is a beast of a first line center, on a beast of a contract- hence he's more valuable)
Nikita, after his insane clutch performances the past two postseasons has really opened my eyes as to what kind of scary "sixth sense" he has with accuracy and velocity on his shot. This guy is the Eastern conference Vlad Tarasenko, an UNTOUCHABLE piece up there with the likes of Sid,Ovechkin,Benn, Kane, Malkin, Karlsson, Tarasenko.
To add to that, a team like Tampa is VERY smart and ahead of the curve in the league, best drafting team post DRW dominance (So long Datsyuk-will miss you) so they would fleece the Islanders in ANY trade involving the two teams I'm sorry to say. Tampa just becomes scarier with each passing season.