Damn, this sucks for the Spurs. Bud was a great lead assistant. When he took over for Pop, it was seamless. He's also very good at "guessing" what play the other team is going to run -- going all the way back to when he called the exact play the Knicks were going to run in '99 on that last shot. Additionally, Bud was a great summer league coach. I really wanted Bud to take over for Pop one day.
On one hand, I'm happy for him to get a shot. He doesn't have your typical NBA head coach personality and he's not a great interviewer so it was going to take a unique situation (in this case, the Ferry connection) for Bud to get his shot elsewhere.
But on the other hand, I'm kinda pissed at Bud and Ferry. You're telling me they couldn't have done a wink-wink agreement to avoid this potential distraction? Sure, it's not going to be a major distraction but the Spurs are heading into the Finals, you don't do anything to F that up. So, yeah, that's lame on Bud and Ferry's part.
P.S.
In the Grizzlies series, I noticed Brett Brown was a lot more involved/active during games. He was the most animated of the assistant coaches and most involved in terms of talking to players when they went to the sidelines, etc. That tells me that Bud probably had agreed to the job at some point earlier in the playoffs and Pop probably wasn't overly please with the timing and has already made Brett Brown the new lead assistant.