My guess is that their mentors are similar, no barrier to entry, and no major organization or entity that holds them accountable for ethics. 

I have spoken with a couple real estate agents and they are scared to let me have the agreement thinking they are breaking some kind of code of ethics letting me have it.

I do not understand your remark as related to the DSCR loan.  2 ADUs are not allowed by f/f conventional financing but is not always enforced.Fortunately if you stay with the current tenant without a refi, by the time you pay principle it is likely the rent will have increased enough to absorb the increase mortgage payment. 

These are professionals with additional training and a stricter code of ethics.

this depends on three things:1) your work ethic and personality2) your hunting and acquisition budget3) your timeTIME: If you're working full time, door knocking is out of the question.

To be successful as a real estate investor in any form - except maybe purchasing the Vanguard REIT index fund - an investor needs education, knowledge and understanding of real estate principles, real estate law, and real estate finance.  

MOST have ethical standards.

•Adjusting bookkeeping records to align with Generally Accepted Accounting Principles (GAAP)•Analyzing financial performance and advising on business decisions•Preparing and filing tax returns (if properly trained)Credentials:•Typically hold a degree in accounting or finance•Some may have certifications like Certified Management Accountant (CMA) or Enrolled Agent (EA)Caveats:While accountants can generate financial reports and file tax returns, they cannot represent clients before the IRS.

II understand the ethics.

Ethics.