Norm - I think LMbass would do a better job of thinning greenies than catfish. Here is why and it ultimately goes back to your old topic of niche behavior & habitat selection (diversity).
Greenies tend to frequent shallow shoreline areas with some type of cover. LMbass also hang out in these areas, thus the two interact and predation will be high on the greenies. Whereas the cafish are deeper water fish and as far as I know do not move into real shallow structure dense areas at night to feed. The greenies at night will probably be resting in cover and protected somewhat from the feeding cats. Cats will be getting fish & critters that are resting more along the edges and periphery and not deeper back in shallow cover. I'm not saying cats won't eat greenies but I think bass will eat more greenies per predator than cats. Also the amount of shore line cover will definately affect cat predation efficiency on greenies.
