At first, I was gonna make a snarky comment saying that there are a lot of Level 3 EARTH Spellcasters, but lo and behold, there are only 8 according to DN's card search, and none of the others have either 500 or 1500 as their ATK/DEF. (Funnily enough, though, 3 of them have 1000/1000, so maybe they would be intermediary stages between Aussa and gramps?)
Then again, just because a monster's stats are similar does not mean they are related. It also doesn't help your case that he has not appeared in any other card lore or artwork, or really anything ever made by Konami aside from DRLG and his single anime episode. Now, if his set number was 026, then that would be more than just coincidence.
Speaking of Mathematician, it sucks that he's jumped up to 30USD -__-