I think before implementing more sophisticated co-op attacks, they should clear some of the mess in battle screens.

With too many effects going on and a messy chat window it is very difficult to track who is doing what. there should be a visual user interface, something like a pop-up window which shows timers and info about the chains and party members.

Maybe a veritcal bar like in FFX where it shows the queue of pt members but instead it shows queued WSs from pt members. Just like in battle regiment attacks but more detailed and informative.