I recall some discussion in the past that feed-trained (and presumably only/primarily pellet-fed) LMB peaked out at a lower max weight than LMB with a good live forage base. I can't remember what the supposed pellet fed LMB plateau weight was, but this limit would certainly apply to LMB in a cage if it applied to any pellet-fed LMB at all.
This discussion was at least a year ago. The recent introduction of Purina Aquamax Largemouth probably would push any pellet-fed bass max weight upwards by providing a better, LMB-specific food source.
"Live like you'll die tomorrow, but manage your grass like you'll live forever." -S. M. Stirling