And I can't close because the seller still has to get done a few things, he claims that he is trying to do it and  nothing in his hands to make it go faster but I highly doubt that and it's taking way way too long, my lawyer claims that there's nothing he can do on his I end, I'm wondering if it is really so (because he doesn't really sound too experienced)

Very few true deals, LOTS of eyeballs on them, and poor information supporting their claims.  

Without knowing your financial situation, you may have a better time trying to do the cash out in your personal name and quick claim it to an LLC to get the better rate.

Also, a couple of lenders are not allowing rental income of any kind to be claimed. 

It will cost more monthly but if you would need to file a claim and its listed as your primary residence you will have problems.

The tenant usually has no agreement with the financial institution and the financial institution has no claim to the tenant's inventory/property, etc.

The seller claims to have only collected rent each month and has no knowledge of the number of tenants occupying the units. 

My tenant claimed there's mold in the unit (there was ~2 sq ft), I had an air quality test done in January, it passed - https://www.biggerpockets.com/...Fast forward to February, she claims there's still mold in the air.

Is quit claim deed the only avenue?

It's those maniacs that buy homes cash via quit claim deed off of craigslist that really get screwed.Make sure your property manager is a licensed real estate brokerage.Google Clayton Morris Fraud and/or Morris Invest Fraud for a cautionary tale of what not to do when buying turnkey real estateUnderstand you can not eliminate all risk, only mitigate it.