If he's a vet, I'm sure there are resources he has access to that others don't, in addition to the regular places for support (eg local church). 

After the fact, you identified red flags and now understand why someone promoting on BP is no different than someone posting on other social media pages...it shouldn't automatically lend credibility to the company simply because they pay to promote themselves on BP.

I don't think I can ask the renters to irrigate the lawn regularly?

I'll send you my regular email.

If you have a regular PM, are you personally listed as the landlord or owner on the lease? 

I have had funding groups do regular mortgages along with offering private money for renovation type loans

I review and update my listings regularly, use all the features provided, post excellent photos, etc.

Ally You got yourself in a jam by allowing them to get by without regular payment for so long.

I had just bought an off market property to flip but didn't have a regular agent I worked with yet.

You can find out what makes the seller decide to sell by getting to know them and communicating with them regularly.