There are also nuances to how to successfully frame applicants who are atypical but still qualified.... self employed, getting gifting, co-purchasing, etc. 

We got pre-approved and the mortgage agent suggested a gift of equity, but from what I'm reading the max would be $50k or so and a portion of that would go to complete the down payment to avoid PMI.

It looks like a gift and there are allowances for this; above a certain threshold gift tax is due…I can only advise you to be honest and to report this to the tax office if necessary (it could even be that you have to report a gift, even if no tax is due... please read the legal text carefully).

I been gifted with a multifamily apartment unit of 4.

I was gifted a property that I would like to rehab and use as a rental.

Way to keep recycling that BP knowledge and continue the cycle of Bigger Pockets and the gift that keeps on giving!!

Soon my uncle will quit claim a property to me as gift.

But as a parting gift, they had flushed a washcloth down the toilet and backed it up, the place had personal stuff left behind including a futon that we had to get rid of, there were 9 days of water/sewer usage they didn't pay for, and everything had to be cleaned yet again.

I also think some people are better gifted or faster learners so it would depend on the individual how much training he/she needs.

Six months plus of free rent is a "gift", you should treat it as such, you've effectively traded your good credit for rent & a "get out of jail free" card on the house deal that didn't go your way.I'd be sure and have an attorney look over whatever agreement you signed to stay in the property after the BK - & also verify that the foreclosure hasn't taken place.