I have a theory about HUGE b but don't know if I should go for it.?

I live in Austin Texas, and there is a lake there known as town or ladybird lake. In it there are pretty big b(up to 12 lbs caught so far), and I think there might be bigger ones. You see, in Austin there is a road that leads up to the capitol building called congress avenue. When they built it in 1980 the engineers coincidentally made it a good shape for bats to live in, so they did. Almost 2,000,000 Mexican free-tailed bats live under congress bridge, do you think that a few large b might have caught on and stay under the bridge during late spring and summer to eat fallen bats. I mean think about it; at least a few bats must fall each day, do you think that's enough to keep two or three 10+ pound b nice and fat most of the year.?