DMB drummer is very advanced, rush drummer as well. most probably wont know this group but dream theater drummer is incredible, as is Tool's drummer.
there is skill and ability, and then there is the ability to create complex rhythms and beats from some of the otherwise, strangest and seemingly unrhythmic musical progressions in existence.
the best drummers usually have a lot of classical and jazz based backgrounds that they meld into rock rhythms. If they also have metal speed abilities then they are at a level that seems almost humanly impossible.