Numerous Titans got physically involved on the fourth episode of TNA. This would be with a month and half until the regular season, with active players that were expected to contribute to that season.
Personally, the Titans have every legal right to stop this, but there's about a 1-in-a-million chance of Pacman getting hurt in a fashion that would affect him over one year from now, plus he is rather lacking in the paycheck this year, so I see no harm in him participating.
Bayley and Asuka are going to have to do some Atlas level lifting if they have Eva Marie and Nix in their feud. Its not enough for Bayley to work with Carmella who had the worst looking hurricanra I have ever seen.