I was thinking he supplies the down payment and acts as a silent partner.

Wealth-drivers are appreciation, debt pay-down (ie. principal payments) and tax shielding.

. - Fortunately, our transparent systems allowed the owner to catch it:)- Full transparency - we would have never caught this honest mistake:(An owner also needs to be involved to approve & fund large expenses: maintenance, property tax & insurance payments (if they want to be more hands off), evictions, etc.A great PMC should also have a chat with you annually about your future plans for a property and your portfolio. 

Even if their Renters Insurance company wanted your insurance info, an insurance represetnative would be contacting you for it.7) You haven't stated if the tenant is current on their rent or withhold rent payments?

so those owners are pretty comfortable - no mortgage payment - and they don't need to sell, and they don't care where an investor "needs" the price to be to make money. 

I would avoid any tool that charges 1% of booking revenue as payment.

This will still qualify for a residential mortgage and you have a better shot of completely offsetting your entire payment.

The terms remain the same, we still pay the monthly mortgage payment.

I texted her the rent amount on Tuesday afternoon (per her request) & the various ways to pay it - she said she would "get with me on the payment". 

At closing, the buyer and their lender determine whether the credit will reduce down payment, closing costs, or as a credit.5.