There was a Bet-C in Stage 2 of the Deep Dive.
The Elite Deep Dive had jettyboots in Stage 2.
Idk whether it is deterministic or not, but in Stage 3 of the EDD we got Twins spawning instead of the first Swarm. (Also 2 Bulks coming from 2 sides during the black-box-event - probably random though). Overall the EDDs last stage was quite tough with all these swarmers and sandstorms and stuff.