I think that is right.
However I have not heard such a threat, having to do with Donald Trump leaving the GOP and mounting an independent party threat.
That would be a massive threat, and I believe Trump is up to it. In fact I believe he would beat both Cruz and also Hillary.
Sanders, I’m not quite as sure about.
But I have not heard the big guy say Trump supporters would lose their posting privileges in that case.
Heck, he might also go.
Could Trump go with the Libertarian party? I am not sure how that would work? Get on their ballot perhaps? Or just campaign for them?