If they had not found the deal or participated at all, you would not owe them anything since it was off-market and they didn't play a role. 

Yes, having tenants pay ACH via a Tenant Portal software is best, but not all will cooperate and some will play games that result in NSF charges.We allow tenants to deposit cash/check/money order directly at our bank into our account.Many Class C & D tenants have challenges adapting to unfamiliar ways to pay and is often not worth the hassle (and possible evictions) to get them to change:(

An MTR play may work well for them.Long story short, it can be logical for a property owner to enter into a deal with an MTR operator.

Unless you bought RE a few years ago, created equity via successful BRRRR, flip, or do a combination you're just playing the appreciation game. 

The operator's track record may not align with your goals (you are long term cash flow play, they are sell and redeploy, or vice versa).  

Seasonality always comes into play!

U know this is how some sharp folks will play this.

I think there is definitely a couple strategies at play here for you and your family. 

MTR is more of a convenience and less of an amenity play.

I'd play that aspect up.Best of luck with this one!