You go Toyota. Sue "Old GM" for everything they've got.
Which is nothing. Nada. Zip. Zilch.
Unless you want a blow job under the table, they have precisely dick to offer up in the event of being successfully sued.
Go get 'em, Toyota.
And when you're done with that, quit being a bunch of milquetoast pansies and start building cars that are worthy of your vaunted reputation and worth actually driving.