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Foxy K
Hitting with the back of the ice block is most practical for the followups, I didn't try hitting them into it but you need to wait a bit so that might cause trouble with mashouts.
As for desyncing, the part I mentioned is maybe one of three big concepts of the whole desync mechanism, being desync for offensive purpose. Defensive desyncing and desyncing in neutral game are also really important.
Think of those as a bit of a wall, covering as many options as possible. Instead of positioning and time gain in those cases protecting the other climber's weak spot and covering options.
When defending, you want to be able to put out a safe defence as quick as possible (maybe Blizzard + aerial) while in neutral game you want some kind of teamwork with almost no commitment that leaves them open (often one climber doing something like an approach while the other one is defending / making that approach
I forgot to mention the C-up desync last time, if you have a guaranteed up-smash, often shield ->c-up is better because Nana will up-smash and Popo can follow up with a bair at kill percents, a fair meteor for combos or an up-air for some techchase situations.
About pivot desyncs:
Pivot f-tilt: Nana will dash attack which takes 10 frames longer.
Pivot up-tilt: Nana will up-smash which takes 2 frames longer (very little window to keep the desync going, ice block is best to continue it)
Pivot f-smash: Nana will dash attack and can act 9 frames faster
Pivot d-smash: Only a one frame window. Give the d-smash a little charge to make the window to continue the desync bigger
IASA's are taken into account
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KingDozie
The thing is that you want to land safely. Often it makes more sense to stay on the platform because you can delay this issue and don't have to be in the air right now, but on the longrun you also want to be on the ground...
If you drop down immediately you could be punished but now have the better position. So if you have some kinds of frame advantage I would always go to the ground if you don't have a big punish on the platform, because you got away with a free and safe landing.
It also is a different story depending on how high the platform is. You have to drop down more carefully if it is higher so often you need to wait long on it to be able to drop in the right moment, while you have more opportunities on lower platforms.