Because Crosby was the best player of his generation and Ovechkin is the best goal scorer in the history of the game. I don't think the gap is huge or anything. I think most lists would rank Crosby above Jagr. Crosby has always gotten a bit of a pass on his lack of scoring titles, rightly or wrongly.But how can you have Jagr below players with 1 and 2 Art Ross respectively if you place such value on them?
Art Rosses aren't the only thing a player can achieve to rise through the ranks, but they are the thing Kucherov has done. That said, he's also been TB's best playoff performer, despite his lack of a Conn Smyth.