tag mode, I don't know, it seems was not so popular in MK9 .... Ed Boon has said that the data information collection they did at that time, showed it was not so much fan favourite ......
I would like a future MK game, with that KOF format : you pick a team of 3 fighter , and play each round with one of them ..... but not using tag team mode gameplay mechanic , but, each one playing a round per time, without assistance
Would be so cool having a team with Scorpion, Sub-Zero and Smoke, hehe