Crouse has one season with more than 20 points (34), is worse defensivly and less versatile than kerfoot and the leafs are adding to make that swap why?

The Leafs are better off giving up that package for Jesse Puljujarvi who is a strong skater who can actually keep up with Nylander, and has defensive upside even though he can't finish like Mikheyev.

Crouse will likely be Ritchie 2.0 in TOR. Ritchie's number in the 24 games he played with ARZ are better than Crouse's in 65 games. I think Crouse's numbers will be better than Ritchie's in Toronto but not enough to make it worth giving up Sandin for him let alone the rest of the package.

Crouse 65GP 20G 14 A
Ritchie with ARZ: 24GP 10G 4A (Total 57GP 12G 11 A)

that return is astronomical for arizona… kerfoot 1 for 1 is still arguably an overpayment.