*looks at sig*
I guessed I'm qualified here.
Now back in the day Dave Mustaine wanted Dimebag to be his lead guitarist for Megadeth, but it wouldn't happen because he couldn't get Vinnie Paul in as the Drummer and Dimebag walked away from the deal. After a while a rivilry formed formany random reasons. After Dave's injury in 2002 he started ending his long time feuds, But Dimebag died in 2004 before Dave could talk to him. If Dimebag lives, we may see him on United Abominations, creating a very different style for sure.
In a path not involving Megadeth, a Pantera reunion is always possible.
The avoidance of his death is one of the events in one of my many timeline ideas, but it also contains a surviving Cliff Burton and some other figures.