I guess they are past the Mitch McConnell lied to me thing.
McConnel is a liar, but the whole "McConnell lied to me" was always fundamentally a lie since Cruz only discovered this fact after the mass revolt of his supporters in response to his actions. Cruz was just depending on the gullibility of the public and the fact most people didn't keep up with all the fine details in order to sidestep the mess his actions had brought him into.
Not really. Ted’s is probably the most brilliant mind in Congress, and Mitch know that GOP voters are furious with him, so why not utilize Ted? Nothing to do with trusting Mitch.