User blog comment:IamJakuhoRaikoben/Chapter 487: The Third Seal, Review./@comment-7418318-20160530202657/@comment-8710495-20160601112416

I dont think mashima was lazy personally i think bradman servearly lacks skill with his curses/magic, i mean he has 9 curses and 1 magic I dont think he was anywhere near the nine demon gates in terms of skill/control over his curses, as with 10 total abilitys he would need 10 times as much training to achive a similer level of skill which considering the fact that the tartaros members are all likly at least 300+ years old he would need at least 3000+ years to reach the same level as them wih all the curses so he likly only focused on a select few with baisic training in the rest.