Not really. Eventually they all run into the Mississippi River, but not until then.
Truman lake has the Osage River, Grand River (not the same Grand River as down there), and several large creeks that flow into it. With that much water coming in, when they shut off the generators at the dam for several weeks the water went up like crazy. After flowing through Truman and the Lake of the Ozarks the osage River runs on into the Missouri River, then into the Mississippi.
Maybe the original shoreline would have worked when the water was 16 feet high. All the reports I saw put the fish up in the flooded willows though. This is a very difficult lake for bass though. Even the locals who fish here all the time can have a tough time of it.
BTW: I have done quite a bit of fishing in Lake Hudson down there (graduated High School at Pryor OK). Almost all of it catfishing though. I reserved bass fishing for all of the good ponds down there.