He and his buyers didn't raise issue with inspection, appraisal, or financing despite me repeatedly asking and encouraging communication, yet closing date came and passed while they failed to close.  

We do plan on using them for our next purchase in the near future.Would it be out of line to keep these other avenues of communication open with all the other Agents in our sphere of influence?

It's not to say bigger partnerships can't work, but they require a lot more constant communication and I think have a lot more potential for issues.I do strongly recommend consulting an attorney to have them draw up an operating agreement for the LLC or partnership, which spells out each person's rights and responsibilities and - very importantly - how someone could leave, or be made to leave by the other people, the business.You'll need to consider questions such as, what if one person dies or becomes disabled?

All he kept saying is, "I'm the only teacher you can communicate with, so pay my full asking price" mumbo jumbo.

Learned ways I wanted my GC to communicate to me and how often.

I still own property in Columbus,OH and I am looking for active wholesalers and investors to communicate.

Do not give this person any information and cease communication with them immediately.

@Marc Winter is there any cheap little device I could screw on that tells me the usage of each unit? 

Most agents are bad on reading instructions (and a few other things), but an equal amount of them can't figure out how to set up Showintime correctly and unintentionally will block all day etc..The other issue is that it will not show up well on mobile devices. 

I've communicate this to the tenants and they are understandably sad as they would rather stay but are understanding of the situation.