That's the process as I understand it.

But I also understand some people don’t really care about the cash flow as much as the security of not having to worry about a vacancy or whatever.

This contract (as far as I understand, albeit I'm not an attorney) transfers the legal responsibility to the buyer, and then my answer on tax consequences stands: interest deduction belongs to the buyer.B.

I'd also like for them to be aware of costs like insurance and taxes, so that they have a better understanding, but I'm not sure that's really that important.

Be careful following the advice of strangers on the information superhighway.

I understand that these rules vary depending on the state, but any thoughts on this?

Translation: you helped your client to protect their cheating against the state assessment.I understand that your client, as a result, avoided paying $45k.

I interviewed the new company using the following articles. https://www.biggerpockets.com/member-blogs/3094/91877-how-to... 

Follow up re-engagement and appointment setting.

Key points include:Security Deposits: In Indiana, there’s no legal cap on security deposits, but you must return the deposit (minus any valid deductions) within 45 days of the tenant vacating the property.Evictions: Follow the formal process carefully.