Gotta love it when someone comes on here asking for knowledgeable advice. Then when they get it, they feel insulted.
All the responses were well meaning and offered something to think about. Up to this point my response has been of absolutely no help to you.
So to make it helpful my advice would be to really carefully consider all the advice you have been offered in above posts. Most importantly, to do your due diligence with independent professionals. Do not depend on any info submitted by the seller. And especially by HIS bank. It's not so much of WHAT THEY TELL...as it is...WHAT THEY DON'T TELL YOU. You need to have an independent bank review the business. If they are willing to put THEIR money up, it makes a big difference. Be critical of everything.
I hope it all works out for you. If not this one, there will be another one. And this one could be a learning experience.