yeah

clearing about as fast as a decked nova sorc, even faster in some situations with a firelock with max bind. Don't even need gcs as the rate limiting factor isn't really even damage. Feels like there is a lot of wiggle room to be explored with this build that could potentially turn into the fastest herald clearer by far, perhaps leading as a demon build with the fire even as a secondary crowd clearing tool.

I think if you just max demonic mastery its a candidate to prebuff bind demon and keep up 1x defiler, its certainly got a respectable herald kill speed
You need to do ass tons of swapping compared to a demon build, but its just a certain number of clicks per game

yea, with prebuff for at the least the initial bind, there is actually quite a lot of potential that has yet to be tapped. If we are talking in a pure min-max, BiS perspective, I wouldn't be surprised if the top build hasn't even been discovered yet.