ZSS gets alot out of this. I had been testing this a couple weeks back; I was able to get dsmash> FC nair> dsmash> nair> stuff. I had been trying to replicate it in a consistent manner and realized something was odd. Never took the data in frame advance to check the reasoning, but this thread has cleared up a ton of mysteries regarding some old but hard to replicate strings I was finding awhile back. Marth always gets swag from uair ff as is, but this seemed from what i was seeing to give him some juicy stuff. I gotta say good job to people doing work in this thread. Reminds me of good ole' Smash Labs *sobs* I miss lovin it up in Smash Labs.
Anyways I for one feel its a solid find; there are already a myriad of near true combo strings in this game that can easily become true combos by the frame advantage received. Im sure all the researchers in here have already done enough due diligence to ascertain that info. With the breaking down of FC aerials we could see some heavier punishes ( although right now FC aerials aside, the top level play in the community isnt making as much use of the true combos already allotted to us now, though im sure it will change), which will benefit the game.
Also to those who believe this to be useless I would definitely force you to reconsider that notion. This game is have an extremely powerful juggling game with a host of powerful uairs, which enhances the threat of a sh. now if they AD this setups perfectly for the abuse of this tactic. Also, noone can say they havent been hit with an aerial right when they thought the opponent was just about to land. Its a typical landing option; one that now can lead into more legitimate damage. Even vs spotdodges such tactics are strong counter option to an opponent whose afraid of being grabbed ( in a game where a solid amount of grabs lead into guaranteed damage or dangerous scenarios). Especially given the fact that they dont have to be committed directly out of jump. Time will tell how much its used in competitive play, however from a theoretical stand point the uses are apparent.
I will say I have been spending time to find more aerials with Bowser Jr.'s unique dair properties. Doesnt look like they exist, but I hope they are found somewhere. havent looked through all the code yet; can anyone confirm Bowser Jr's dair as an anomaly or what?