Here is a Google Doc I threw together in an attempt to cover all the "mechanics" of the Time Attack glitch, party swap and Art Inheritance and duplication: https://docs.google.com/document/d/1a2nB9V-1Sg1JksTR5B2p2sHv0JtI-GaV0dAtrMRTCSQ/edit?usp=drivesdk
This doc will be edited with new details day after day, and it's an anyone-can-edit Doc, so if there's something I wrote that's wrong or badly worded, if you want to add videos or resources and info in general, et cætera... Feel free to do so! The more info the better ^_^
And here is a table to know which Arts have the same animation Index (big thanks to Cross from the Discord for having done most of the work for this table btw ^^) : https://docs.google.com/spreadsheets/d/1ryDmoF1dK10OVnhg0A2EOEVYrcN3muCGIrBPZuGsTUs/edit?usp=drivesdk
Basically, with this you'll be able to know which Arts take the animation of which Arts for X character when inherited.
Hopefully those two things will help those who want to explore the Time Attack glitch. ^^'