However, this price is much lower than the listing, and the seller is unlikely to accept it.

I just accepted your friend request and followed you bac 🙂

Yes you can you need to pass both tests. 7 days or less and the material participation test which I have outlined above 

While I never before or since accepted any like offer, the amount I was paid for minimal time was too good to pass up.

I would like to have a loan calculator in order to do offers with out using mortgage broker before have accepted offer.

A concession is primarily for the buyer(s) benefit, it can help seller(s) to sell a property but there is really no advantage to a seller accepting an offer with a concession except that it is incentive for the buyer(s) to focus on that property, it makes the terms more attractive. 

Credit score is acceptable, he has no evictions, have enough income to cover rent comfortable. but then i am here as it's useful to learn from others experience for this kind of profile and background that I have no experience with.   

After much back and forth with our attorney and their regulators, etc they decided series LLC’s should be a part of their customer base and have rewritten their policies to accept them (and us).

You can use a  hypothetical  purchase price and loan amount for the pre approval process  as this will get revised to the actual figures once you have located a  proeprty and have an offer accepted

It sounds like I should wait until mid to late next year at least to accept any offers.