If this is a salary cap league then yes.
If not... I would try getting a little bit more with Kucherov (a slight uptick in picks or something)
Reason being is that Kucherov is good, but when Stamkos comes back there is less puck to go around...
This might also help Kucherov increase points, but it might also decrease points cause Stamkos will be involved more.
With Kane, you know what you are getting because there are no significant lineup changes like Stamkos coming back and all the RFA concerns.