I haven't listened to the interview.. but my impression of why URL blocks certain battlers is simple (and I think others have a similar view).
If URL is responsible for the battlers name being big (even if said battler worked themself up to the URL stage), then they block the battles to protect their own investment. If a dude diluting himself gives URL the perception of risking ticket sales, then you go cutthroat and keep that from happening. shyt ain't pretty, but it's part of this game, and many others.
As a fan, I don't like it for obvious reasons -- lost battles. But objectively, it's to be expected. In the NBA, if a dude's contract is up and you get a bidding war, you gotta bid that dude up or at lea