AMillionHP
[13] Hero
That is why I used Team Battle as an example, it is a cheap mode to be made since it doesn't use anything but existing assets.
Just remember that SCV mimics were also majorly past models, in fact I'm of the opinion Pyrrha Omega was a story mode only character at first and Elysium was meant to have that movelist. Alpha Pat, Pyrrha Omega and Kilik all look as last minute as it gets, no 2Ps is a big red flag.
When you say "team battle" are you talking about tag options mid-match? Or just something involving turns between rounds and matches?