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Make it a 'Command Lance'.
When the mode is created, the mechs in one random lance get marked as commanders. This prevents possible shifting of players in the lance to certain mechs.
Same approach.
The command lance needs to get to the extraction zone.
The more mechs from the command lance that can get there, the higher the bonus for the defending team.
Match ends when the last command mech still alive is in the extraction zone or all of the command mechs are destroyed.
The attacking team gets a bonus for each command mech destroyed and will win the game if they kill them all.
That sounds similar to breakthrough.
The only difference is in breakthrough both teams are trying to get through the other team to extract and the first team to extract X mechs wins.
And you could do variations of breakthrough where you might have to capture an info beacon or something before you can attempt to breakthrough to extraction.