If Windcharger is quick, he could immobilise all the others in his magnetic grip. He could remove any detachable weapons (as Jazz did to Sector 7 in the 2007 movie). Therefore, no glass gas and also no flying Gears, no skilled moves from Bumblebee and definitely no smashing from Brawn. Windcharger could then rip the other five Autobots apart before they try any other tricks. It would be a tragic slaughter. I wonder what could make Windcharger do it? Perhaps he discovered a massive, secret corruption scandal in the heart of Autobot society, as in the IDW comics? Alternatively, a cerebro-shell from Bombshell would do the trick. Anyway, it would certainly traumatise a lot of readers / viewers!

If Cliffjumper is quick and catches the others in a small area, he could glass-gas them all and then shatter them.
If Brawn is quick and catches the others in a small area, he could kill them all with his bare hands. If he hesitates, Huffer and Gears are strong enough to stop Brawn while one of the others delivers a killing blow.
If Gears and Huffer pick their moment, they could give speeches about how life on Earth is terrible and everything is depressing and hopeless. The others may decide that life is no longer worth living and therefore they should kill themselves.
To be honest, all these Autobots trust each other usually. If one of them turned against the others, he could lead them into a deadly ambush or trap and they wouldn't know what hit them. They wouldn't expect treachery at all.