All I can say is that this is the reason Delay has given time and time again. And I believe it. I cannot believe he would quit if he thought he could win.
Bottom line: The GOP in that district needs to hold a primary the first week of September. Period. Full stop. That will stop the possibility of having multiple GOP candidates. It also means Delay maybe be required to have his name on the ballot by law, but he need not be the GOP nominee. The ballots can be prepared with a different name as the GOP nominee.