Going through platform

Here are a few informations about platforms mouvement :

1 : a general rule with platform is that some animations disable you from  inputting the go through platform action. Auride made a post on reddit to talk about it and how to avoid it.
https://www.reddit.com/r/smashbros/comments/8aj9wv/turnaround_platform_drop_a_way_to_avoid_getting/

2 : In general having the stick tilted down is enough to directly go through the platform and not landing on it (unless in the middle of aerial or airdodge). But in the case characters with multiple jumps (Kirby, MK, Pit) they are forced to land on the platform if they are in the middle of the double jump animation (which last very long). They are no way to get around this forced landing, but using turnaround platform drop you will save frames.