The reason why I say yank the LMB out is that it might spawn with a SMB, and the size of the fish that it can eat. No worries about that with HSB.
With the 8" LMB in there, the 2"-3" PS are the perfect eating size for it.
The general rule of thumb for stocking is to stock fish that are larger than whatever is in the pond can eat unless you are stocking fish strictly for forage. You want to have the stockers stay alive and spawn, and have their YOY eaten rather than expensive stockers. Moreso the LMB than the SMB, but you never know.....
LMB prefer to eat fish 1/4 to 1/3 their body length, even longer if they are fusiform shaped (like YP and GSH).
Remember you cannot tell a fish "Hey, only eat the FHM and GSH, leave the PS and YP alone until they spawn."
