Say no more, with that crazy damage scaling, Static Monk dominated all the Season 4 leaderboards before getting hit hard by the nerf hammer in Season 5 to never be seen again. In groups, it turns out that any player in the party could proc Static Charge s applied by the Gen Monk, as any damaging hit with a proc coefficient on a monster affected was able to proc a Lightning tick to all other monsters affected by Static Charge, this chance being affected by the proc coefficient (which is why Fists of Fury was used in solo). Meanwhile first iterations of Gen Monk were playing Mangle, some players eventually found out during the Season that Static Charge in combination with Fists of Fury was way stronger.
All the way back to Season 4, Shenlong's Spirit got reworked to massively buff the damage output of Generators, which allowed 'Gen Monks' to become a strong META build.