That would be a pretty good trade for the Ducks but with a Karlsson extension, they wouldn’t much wiggle room in 2019-20.

It's clear from last year that Perry has lost a step. I wouldn't touch him. Plus, another 3 years at 8.5 is a bit much. Makes the RW very old and very slow for O-Town.

The other pick could be a 3rd in 2020 or maybe Jacob Larsson?

If the sens are trading Karlsson it is the beginning of a rebuild. Perry who is naturally following his aging curve has been on the decline for 4 straight seasons and is signed to an expensive contract he can't play up to anymore for another 3 seasons. Perry would (Should) not be included in any Karlsson return.

Montour is a good start. You have lots of other great pieces roster wise: Fowler, Lindholm, Manson and a blue chip prospect in Steel who will be ready to make the AHL/NHL jump next season if they wanted to keep the roster more intact for a few more Getz/Perry cup runs.