Megadeth - Prog Related

I don't know.  If Megadeth get in, people will argue why isn't Testament in, why isn't (slightly-progressive thrash band) in.  A very touchy area.  I think some bands similar in style like Nevermore have been rejected already. 

But, then again, prog-related isn't prog, so either way I guess. 

I was wondering why there is Metallica to be found in the Prog related sub-genre, but not their rivlas Megadeth with Dave Mustaine as front man. I actually moved to prog after listening to very much speed and thrash metal and can say that Megadeth is much more proggier than Metallica, even if it's not prog entirely. If you don't believe me listen to tracks like: My Last Words, In My Darkest Hour or Holy Wars.. Punishment Due. The latter is actually two songs in one, with the same concept but different solo passages and melodies, which in my opinion is very prog related. Don't get me wrong, Megadeth isn't real prog, but much more prog related than Metallica in my opinion.