If you read my first post, you'll notice that I said to give the intake manifold gaskets a look AFTER you're done with the MAF.

IAT sensor just helps the ECU determine air density (based on temp.). Unmetered air entering the engine (and being detected post-burn) will always point to the MAF. The intake gasket leaks are usually intermittent enough that they won't throw a code before driveability suffers. In fact, both of my trucks sprung leaks at the intake gaskets without a code at all.

If you rely solely on CELs to diagnose problems you're in for some long nights. Check the obvious, like you said, then check the likely.
If he had ruled out the MAF (could've just checked for continuity at the engine side of the sensor), where should he go next?

Having spent a number of years behind the wheel of a tuned scooby, I learned that CELs are only a guide, and not the be-all-end-all of engine diagnostics. Your statement "...if getting a code for the MAF then that is the problem..." smacks of finality, and will lead to headaches if you start replacing sensors unnecessarily.