I love this approach financially, but I'm not an authority on whether it's legit.

That in itself will lend SOME credibility.

Better relationships equals more credibility, more trust (knowing they will eventually pay) and most importantly more income.

I think I need an "Authorization to Release Information" from his bank and a purchase and sales agreement. 

If the daughter never got legal authority to sell, that is likely the reason, and everything else will be a waste of time.

If the house was deeded to someone else, then the current "seller" doesn't have the legal authorization to sell the house, even if their name is on the mortgage...

I do know that BofA  limits Equator credentials to licensed people so if there is any sort of fraud or wrongdoing, they can apply to the licensing authority with their complaints.I've done a number of comments about the short sale process.

Hi my wholesale company sells about 100 properties a year and our team has over 45 years in the professional field pm me if you would like to work with The Wholesale Authorities, LLC 

She didn't give me the Sellers phone number saying she is not authorized to do so!

Those people are not going to let one deal affect their overall reputation and credibility.