H1B and GC sponsorships come from the same pool. In other words, a Green Card application is sponsored for H1 candidates. You are double counting your numbers.
I do agree that this expectation that one sitting in Ohio will command the same salary working for a FAANG company is just wrong. Very likely, the companies will adjust their salaries based on where the person is.
My understanding is that sponsorship on at least the E-3 is difficult or impossible; that visa is not "immigrant intent", which ostensibly means something in the statute with respect to paths to permanent residence.
Just because a visa isn't dual intent doesn't mean you can't apply for a Green Card. TN, E-3 etc can all lead to a Green Card but you have to time it right.
I do agree that this expectation that one sitting in Ohio will command the same salary working for a FAANG company is just wrong. Very likely, the companies will adjust their salaries based on where the person is.