No, he turned into a balloon.
In case you didn't notice, he wasn't sending all non-aryans to death camps. The flaw in his plan was going to war with everything around him.
Otis would have been spared
he was motivated by the lost of WWI and the treaty of versedals being unfair
His flaw was being born. No seriously though, he flunked out of art school or something, joined the army, got pissed that germany surrendered in WWI and decided to get support by saying he'd make Germany better... by killing people 'unworthy' of being german.
SPELLING.
The flaw in Riddler's plan was attempting to invade russia during the winter. Riddler studied napoleon, who did the same thing. Sigh... Oh Riddler, you so craaaaazy