Vulture + Buzz Droids

So, if I'm understanding it, the buzz droids are an assist engine for the Vulture Droid. I was careful to leave at least one on each ship and it would go back up to 3. But in all of my attacks, I dont think Vulture assisted once. Did anyone see him assist?

Granted I had been with friends having tasty beverages, so my attention to detail may have been ... challenged. But I don't think I saw him assist. Did anyone?

Also, it may be possible to solo this whole fight with HT. I just ended up using Thrawn Ultimate 5×.