It's not a guarantee ofcourse but.... 

They require a personal guarantee so will look to your personal financials, regardless of the LLC or not. 

and guarantees that mom and the aunts get the property.

I can guarantee you that the manager of the Marriott is not going to invite some of his renters to his own house to shoot guns, drink beer from a kegorator and have a cookout, but I do.

English may not be his first language but guaranteed he understands it well enough to screw you over.

If you hold then you open up the doors for a 1031, and you will get significant tax benefits with depreciation and you won't be guaranteed to find another deal this good.

What are my guarantees?

It's no guarantee but it's a good place to start.

I am not sure what your accountant is trying to get at.The way the partners get paid is via  Guaranteed  payments. 

Partners can't be employees of a partnership they have equity in, just like a sole proprietor can't be an employee of his or her proprietorship.Partners usually take a "guaranteed payment" if a regular, salary-like payment is needed.Perhaps add a tax CPA/EA to your team if your accountant is a bookkeeper/generalist and has limited understanding of tax law.