Well the ducks are likely going to be outside the playoffs in the next 6 weeks.
I don't see why Manson wouldn't waive
The Leafs are 29-10-3
They are sitting just outside the top 5 in the league and they have games in almost everybody they are chasing except Carolina but Carolina.
The Leafs are a legitimate contender I see no reason not to waive
Even if they are, it's probably not going to be by a very wide margin. They are 9th in points percentage right now, behind Edmonton and ahead of Dallas.
The Ducks are honestly in a nearly impossible position from an optics standpoint. The team isn't very good, and isn't all that young. They've got a few really exciting youngsters (Terry, Zegras, Drysdale); but have 4 core players coming to UFA status. 2 of them (Rakell & Lindholm) need to hit on their "career" deals being 28 years old. Manson probably looking at his last big contract.
If you "rip the heart out of" f the team at the deadline, I'd imagine Getzlaf is gone too... but if you do, the haul for those 3, maybe even 4 with Getzlaf, would be huge and likely set this franchise up for years of success. Trading all 4, I could quite easily see 2 first round picks (Lindholm & Manson), 2-3 NHL ready prospects (Lindholm, Rakell, Getzlaf), and a couple more 2nd & 3rd round picks (Lindholm, Rakell). Team's going to #### for the rest of the year, but will have cap space, and California sunshine with which to go to work in free agency.
It's also pretty difficult to "toe the line" between the two extremes. Trade Manson and keep everyone else, you haven't done all that much to improve the long term outlook.