To me, it's surprising how small a large HSB's mouth gape is...as such, we are all wondering how much they control bluegill populations, let alone crappie.

I would doubt that none of the original (200) LMB survived.

Regardless of the survival/or lack thereof, I see no issue with adding (20) 12" LMB.

Excerpt from Robert Crais' "The Monkey's Raincoat:"
"She took another microscopic bite of her sandwich, then pushed it away. Maybe she absorbed nutrients from her surroundings."