In The Sting, Snyder who knows Hooker by his right name hustles Lonnegan out of the fake race parlor. Important to the entire sting was that Lonnegan never finds out that he has been taken. But suddenly these two are thrust together -- what if they chat and Lonnegan realizes that Hooker has been lying about his name the entire time?
This seems to be a major flaw in the entire plan. Lonnegan has very long tentacles, is certainly not going to forget about losing the half million.