I really don't see the point in it - Pantera was what they were because of the sound those four guys made together and Dime was a massive part of that. I could imagine replacing Vinnie or Rex without it making such a difference, but Dime's playing is smeared all over that stuff, there is no getting away from it and his style is very signature, he was no also-ran. His tone and approach were notably different from his pears - you can tell when its Dime playing. The same can be said for Zack, but that very fact makes for a weird combination if they were to tour with him playing Pantera songs. Leave that band to the history books, they had a glorious career and it should be left that way.