This is pretty common to keep your first few purchases in your personal name in order to take advantage of high quality loans early on. 

I can't see much advantage to separate LLCs in this situation.

The fact that you are looking to stay and are willing to buy down your rate is a smart move consider you don't plan to refi and want to take advantage of the current low market.

OR do I have to wait until the properties titles are officially in our names 2020 and then starting 2020 taxes I can start taking advantage of tax write offs.

How do we use her being a realtor to our advantage.

One of the advantages is that you will have access to MLS (also a monthly recurring expense). 

Sometimes, that could boost your cashflow a little bit more by targeting another market with different advantages. 

I don’t know why there would be any advantage of bidding early unless it will stop the auction.

There are a lot of advantages to building an ADU right now and I want to get started.

There are the tax advantages of holding the property which is currently in an LLC, but I'd imagine I'd use some if not all of the proceeds to get back into another property of some sort to reap that shelter.