Hijacking the thread:

Same exact play as the OP, except the initial pass is an inbound pass.

Since it's important in this instance, when exactly does player control take place?

Still bcv if a2 dribbled the ball and not just trying to gather the ball. Throw-in exception applies only to the first person touching the ball.

See the definition of control in 4-12-1

Even if the throwin hadn't been tipped, it would still be a violation.

A2's dribble established PC in the FC. He then took it into the BC with his dribble (the 3 pt rule only applies going from BC to FC). Violation.

Correct, which was my thinking on why it was a BCV, although it looks like now I was over thinking it. The coaches argument stemmed from judgment on what constitues control. I judged the player to have control immediately based on the nature of the initial contact and the actions proceeding it. The HC argued that control couldn't exist until after that second dribble at which time the ball had BC status.

As I understand the rule now is that once team control is established anywhere on the court, the ball achieves front court status, and is touched last in the FC by the offensive team, and first in the BC by the offensive team, that it is a BCV.

Am I learning anything?

So for a ball to have front-court status, it simply needs to touch a player in the front court, right?

Yes, I would only add that due to the changes in TC on a throw in, PC needs to be established inbounds prior to or concurrent with the FC location of the ball.

As for the coach's argument. The dribble starts when the ball is batted, pushed, or thrown to the floor. We don't always know if it's a dribble or pass until the player touches it again, but that doesn't change when the dribble started (and thus PC began).

I did not say a dribble in this case would not trigger a bcv.

Or the floor. 4-4-1

Sorry, that was the impression I got from your reference to the throw in exception.
I was just pointing out that the throw in exception wouldn't apply anyway.

It must either touch the court or a player in fc to have status.

Still with the hijacked-thread-inbound-pass play--Dribbler's first bounce hits the division line in the OP.

Since a dribbler needs two feet and the ball in frontcourt for frontcourt status, then how is it a backcourt violation?

The ball was touched by B2 who was in the FC prior to A2 dribbling it, giving it FC status.

Read 4-Ball Location to get your answer.

Three points only applies to a dribbler going from BC to FC, not the other direction.