I have to disagree with your statement that a large percentage of hybrids are gone. There are still plenty in the lake.
The 10"-15" hybrids are plentiful. I will not dispute that. However, there should be a good group in the lake that is in the 21"-24" range. They simply are not there in any numbers. Starting to see more 18"-20" fish showing up in the deeper water now that water temps are climbing. At this point I just don't think there is any disputing the fact that RC lost a huge number of stocked hybrids. Of the lost fish I think a good many were the bigger fish. I have no doubt there are a few bigger fish left. I'm not saying they are all gone. But if you don't think the hybrid fishery at RC has suffered at least a significant set back I think you are kidding yourself. I'm sure many North Texas lakes have the same situation.
Good news is the white bass fishing should be outstanding for many years to come.