For what it's worth, I had a WOZ with issues.
I ended up contacting Jack directly. I was super-impressed when he picked up the phone himself and made time for me.
He made me a promise to make everything right. It took longer than was originally discussed, but in the end everything worked out. I found that he was/is a man of his honour. I am certain that JJP lost money on the sale of the WOZ that I bought after everything was said and done.
I never posted my issue publicly.
So that's my story/firsthand experience.
With respect to your issues, I would recommend the following:
since you're asking Jack for assistance (I expect he could have told you all to take a hike, legally, right?), why don't you give him some time instead of publicly posting the problem, trying to shame him into helping you?
Bumper was the one who outright screwed you guys, not Jack.
I'm really sorry that you guys went through that. I can't imagine how frustrating this must have been for you all (and continues to be), but don't take that frustration out on the one person who's going to help you.
Especially given the fact that he's trying to run a new company.
IF (and it's only rumour based. I have nothing official to go on) his new company is having cash flow challenges -as most new companies do, then it's pretty impressive that he's stepping up to the plate to help you all out. He may however need more time. Be patient. -and best of luck to you guys. I do hope it works out as best as it can for you all.