Hi Rob_TO,
I stated the reference form IRCC website about needing 3 NOAs. You can check theat line mentioned in blue back ground.
Your point of view is that IRCC office will consider 0$ as income and add Co-signer income in case NOA is not available. Is there an official reference from IRCC guide or website for this or it's what you are hoping IRCC officer will do?
Second point, When I said, why someone can't allow In-law's to be sponsored , I am exactly stating the same point you stated above. What I meant to say , by making that point is, if Sponsor does not have 3 NOA's, this is what exactly is happening in-directly.