I asked for diversity in the hopes of discovering something new and exciting. That doesn’t mean that I will put everything suggested in the OP.
The Droog was a great suggestion, and well worth spending some time testing it out.
But if it can’t deal with mobs without running out of ammo, nor kill the raids without running out of ammo, then the situations where it shines are really limited. The Pitchfork can’t mob at all, even less than the Droog…but it can kill ANY boss in the game with its ammo supply, raid or not.
Based on that, I would rather include the development than the Droog (as you proved the development can kill any boss with ease)
The Striker is there for its mobbing abilities. It can reliably mob with spending less ammo and fits better to a methodical playing style than the Flayer. That’s why it’s there.
The Droog can kill mini bosses better than the pitchfork that’s true, but it can’t mob or kill raids.
A mobbing gun is a mobbing gun, and if it can do mini bosses, that’s even better. But a bossing gun should be able to kill bosses…all of them.
