The Jedi Battlemasters can be up front to provide interference.

The GenoHaradan Assassins can shoot, but they are much more powerful when they can get adjacent. While shooting, they get only one shot, which will do either 10 or 20dmg, depending on whether Cunning Attack is relevant. When attacking an adjacent enemy, they get Twin Attack from the Liaison. They also get Poisoned Blade, which adds 10dmg and possibly 20dmg more if the enemy fails a save. The enemy saves for both attacks, so a GenoHaradan Assassin can do up to 100dmg on a turn, if they hit both attacks, have Cunning active, and the enemy fails both Poisoned Blade saves.

The Liaison gives Twin Attack to the Assassins, and can also help move them around to get adjacent and get their Loner bonus.

The Defel Pirate will probably just die, but if you can get him adjacent to an enemy first, he can do 20dmg from Self-Destruct on his way out.