Probably a malicious thought by Pete to clear data ( units of any kind ) from the data base . I believe the thing to where the GATK will engage everybody , including allies , is exceptionally stupid . I have just barely south of 1 million Kur divisions on one of my main planets in Andromeda , and if anybody were to break through the hundreds of billions of tons of mobile warships and the surface installations , then somebody lands troops on the place , then the Kur divisions kill whoever would land , and then I have to put the troops someplace else , and then land Ori divisions to retake the place . Think of the amount of orders that would take . A complete win / win for RTG . It would cost me several hundred dollars in real money to get things back to the way they were ( and then remember I have to input all the build orders again ) .
I could transfer the divisions to the Ori position , but the Kur are the ultimate ground pounders thanks to species engineering . I guess having the Kur defend an Ori planet is worth the thought of the attacker's face when they get their turn , and then see what they landed on .
But yeah , I wonder what Pete's rationale is to have total allies attack each other in a ground combat situation .