(however this mirrors the college grad scenario of if every job requires 2-3 years experience how do you ever get a first job) And even if you could separate the LLC from you personally, how would the LLC's DTI every qualify?

With fanny Mae/Freddy Mac you could do as low as 5% down for a SFR or 15% for a duplex if you qualify (strong enough borrower which sounds like you may be).

How Do I Get Pre-Approved For Loans With Just Great/Good Knowledge, Some Home Improvement Skills, A Fix and Flip Team Ready To Deploy, Great Planning and Lucrative Profitable Deal Appraisal Skills? 

But before trying something you've never done before, you first have to understand certain skill sets are needed to run a business.....and yes wholesaling is a business.So before you go ahead and start your wholesaling venture and build your real estate empire I think you should ask yourself the following questions first:1.

even if legally you could hold the second person to the lease does that second person income qualify to double their obligation?

You're way to early in the game to worry about advanced negotiating skills.

They wanted a conventional loan, and qualified for a conventional loan from a different lender.  

PM your email and criteria of a home (beds ; bath ; sq ft ; side of town ; etc.Have you pre qualified ?

I specialize in qualifying buyer for seller financing.  

Talk to a couple lenders to see what you would qualify to borrow.