Another Backcourt situation
 

A1 dribbling, advancing from backcourt to frontcourt, has both feet in frontcourt, last dribble in backcourt; then the ball comes up to his hand, and then hits his leg, and then the floor in backcourt. A1 reaches across the midcourt line, and continues the dribble.
Do we understand the "both feet and the ball in the frontcourt," when advancing from backcourt to frontcourt concept to mean that the ball has to hit the court, to satisfy that requirement, or does 4-4-2 make the play a backcourt violation?

If A1 hasn't ended the dribble, I'd say that the "three points" criteria still stands here, and I wouldn't have a backcourt violation.

The contact with the leg does not end the dribble.

No violation.

I believe this is also stated, "could an interrupted dribble end the '3-points rule of thumb'?"

I would say no.

Agree...no violation. The dribble has not ended so it is still "during" a dribble.

And if the dribble HAD ended, it STILL wouldn't be BC: the dribble ended before the ball had FC status, so you'd have an illegal dribble before you had BC.