I have bja2 and bja3.

Given a player/investor and spotter.

If this team were going to play:
10g invested, play until 20g settle.
10g invested, play until 20g settle.
10g invested, play until 20g settle.

Don't you potentially have the same issues you would face if you settled before doubling the first bank?

The easy answer would be to play until the bank is tripled, but I don't think many spotters would be that patient or perhaps even live that long.

So would a possible solution be to have an escrow held until the final breaking of the bank?

How big should the escrow be?

Oh, feel free to edit me anytime! LOL
I know I need it. However, I know it's only because great minds are hard to follow!