Why is Dream Theater in that list?
Because I added them. 4 of the 5 members have bitchin' beards. That's 80%, compared even with founders ZZ Top, who's drummer could only grow a mustache, that's 66% beard. Therefore, Dream Theater is beardcore. Whether they are true beardcore, progressive beardcore, beard prog, or beargressivecore, is up for someone else to figure out.