The best move depends on a few factors in my opinion. 

Financing deals through your LLC will be more expensive.And, as soon as you mess up one transaction or one signature block, you very well could have just "pierced the corporate veil" and rendered all these LLCs meaningless, depending on how it was pierced.At the end of the day, this is not a matter for BiggerPockets.  

Of course, there is no right and perfect answer and it all depends on you and what you want to handle.

As many people will tell you it depends on your goals.

Remain disciplined and patient, taking your time to choose the correct offers, carrying out extensive research, and refraining from hurriedly making investments out of desperation.

Probably depends on what drugs...if they're smoking a little pot, I'd probably just mention it to them, and ask them to please not do that in my property. 

We did not choose lender insurance on the purchase agreement (our agent misguided us so we thought we did, but just realized we did not).

There may be some reasons why it's not and only a CPA, EA or Tax Attorney that understands your full picture will be able to offer good advice on that.The Mgmt company will be it's own complete and separate entity with no ownership over any of the other LLCs.You may choose to have an umbrella LLC over the LLCs that own the property, but that's not really necessary.Set up your bookkeeping for the mgmt company. 

There are only scenarios that work for each person depending on the situation. 

Coverage and terms may vary depending on the type of warranty you purchase.