Dude, the OP said he wanted a scenario leading to an Undisputed Welterweight Champion. An Undisputed champion means holding the WBA title and two other titles of the other three major sanctioning bodies of boxing (WBC, IBF, and WBO). If they just fought the winner would be at best the unified welterweight champion, holding the WBA and WBO welterweight titles. So do the math...the winner needs another belt to be undisputed.
Yo, *******, better watch it with the name calling. Did I call you anything to make you utter obscenities? Because if you think you will win an obscenity filled argument, you got another thing coming you ignorant, shameless, trashtalking ***** **** face. I was just mentioning how to be undisputed you need 3 of the 4 major belts, with the WBA title included. Now, you're going to call me a ****en dumbass? Learn your facts and learn how to spell you ignorant ****ing cocksucker.