I would obviously take care in the future of making sure all income and expenses were clearly split and there was no commingling of funds, but my biggest question is whether I can do that "assignment" of the contract from my normal LLC as the purchaser to the 50-50%  with the IRA?

Clear of both.

Clear of both.

It was not made clear the lease would still be in effect and I would be responsible for entire month. 

Now here is another issue the note and mortgage clearly stated that any recourse would be against the property only and no recourse against the borrower in the event of default.

I had to immediately dispute it and get it cleared up, and my score was restored within 30 days.

After successfully winning an auction, what would I need to do to clear it? 

If you are still having this issue, it's clear who the culprit is.

Clearly, this poses a huge risk given that they are the largest tenant in the property and pay almost half of the annual real estate tax.6.

So to be more clear, an example:• purchase price $50k all cash• rehab cost $30k• ARV $85k (note, all in cost nowhere near 75% ARV in this case)• purchase price of $50k is 59% of the $85k ARV• refinance at 75% LTV of $85k - you get $63,750 cash back in theory minus closing costs...So am I missing something here?