Since FHA is not an option, i would advise that your seller needs to work on their credit score and savings to qualify for a conventional loan.

(Senate Bill 33, for those keeping score.)

Having an idea of the appreciation is an important part of keeping score.

that we’ve learned in our 24 years, managing almost 700 doors across the Metro Detroit area, including almost 100 S8 leases:Class A Properties:Cashflow vs Appreciation: Typically, 3-5 years for positive cashflow, but you get highest relative rent & value appreciation.Vacancy Est: Historically 10%, 5% the more recent norm.Tenant Pool: Majority will have FICO scores of 680+ (roughly 5% probability of default), zero evictions in last 7 years.Class B Properties:Cashflow vs Appreciation: Typically, decent amount of relative rent & value appreciation.Vacancy Est: Historically 10%, 5% should be applied only if proper research done to support.Tenant Pool: Majority will have FICO scores of 620-680 (around 10% probability of default), some blemishes, but should have no evictions in last 5 yearsClass C Properties:Cashflow vs Appreciation: Typically, high cashflow and at the lower end of relative rent & value appreciation.

DSCR loans are based off of down payment, credit score and either actual or market rents so it helps to supercharge an investor's real estate goals and net worth.

. :)  these are not credit score loans ( I mean I have a credit score) but thats just a formality its all about capital and relationships with your bankers and deposit relationships thats key as well.Yes your relationships with sub contractors will be a huge factor in profitability, both direct and indirect. 

Appraisals came back awesome my credit score came back 720.

Seller financed (probably) won't be reported to the credit bureaus and so won't impact your credit score at all.

Since its equity I didnt think my credit score matter but does it?

What documents do they require, what credit scores do they allow, how do they verify previous rental history, etc.?