Ok, I’ve read Cap 7, and Red Skull just pops back in again complaining that everyone keeps underestimating him and leaving him for dead and everyone will soon regret their mistake. No further elaboration, and same stuff as in Cap 3, really. So it must be in later issues that the origin story is fleshed out. Since Maxon’s name is only mentioned in Cap 1, and never in Cap 3, the later origin story(whenever that might have been published) could just as easily have identified the first true Red Skull to be in Cap 3. But again, that paragon of wisdom, Wikipedia says the later origins point to Cap 7 as the first true Red Skull. Not sure this all makes sense; I fear I am obsessing again.