impressions after re-watching the first two episodes:
Mike Mangini - very likely to be the guy. not only is he highly skilled, his personality seemed to mesh the best with the other guys.
Derek Roddy - was an odd choice for an audition. looked out of sync from what they showed us. didn't seem to have the chops to play with the rest of the band, but again it was only a few minutes to judge him.
Thomas Lang - impressive. didn't hesitate to add his own touch to the audition, unfortunately that rubbed Jordan the wrong way (which bothered me). Held his own, but again I didn't see the chemistry with the rest like I did with Mangini.
Virgil Donati - same as Lang, minus the Jordan put down. For some reason I could see "artistic differences" becoming an issue down the road.
Marco Minnemann - he was the most entertaining for sure. I can see why the praise was given out, but I don't think his personality will fit with the rest in the long run. I can see him working side projects with the guys and that could be amazing.
With two auditions left, I don't see any reason to think it won't be Mangini. He just seemed to fit the bands personality the best.