I'll try and write the guy some thoughts about deal making in the next few days, esp. if he is receptive to advice. I have pertinent thoughts about stuff like this, here's just one example that probably hasn't been considered.
Bear gets a pair of 6's against a 6, pulls 25k out of his pocket to split, makes a 17 and a 19, dealer makes 18, push...sort of ! Can he pick up his 25k and RX's 25k and leave, up 25k ?
I have good blackjack knowledge, esp. thoughts on what's fair to a backing deal , for both involved parties.
You never need a backer to double, the backer is there for splits. Allowing backer to DD could cost you the 25k, if you make a bad deal.