BTW, I don't think this has been covered already, but does anyone disagree with me that Captain Aero's numbering (v1#7 in the indicia for the first issue) continued from Green Hornet, which ended with #6? The commonly propagated theory for Captain Aero is that it continued Samson's numbering, which I think is just more fallout from the Holyoke myth. The first Captain Aero issue was from Helnit, not Holyoke, and Holyoke did not acquire Blue Beetle until several months later. Blue Beetle #10 was the same month as Captain Aero #1 and the last fox issue (#11) was two months later. I can't think of any reason that a Helnit title would continue the numbering of a Fox title. Especially when there's a canceled Helnit title with exactly the right number available. Someone just conflated Holyoke and Fox and grabbed a six-issue series that ended at more-or-less the right time (half a year before Fox called it quits!)
The Harvey (Family Comics, Inc.) Green Hornet started half a year later. Whether it managed to also get the mailing permit somehow (Goodman apparently managed that with Comedy and Daring) or whether they just started with #7 to avoid confusion among readers, I don't know. But I don't think that Harvey's series, from several months later, is reason to assume that Helnit didn't recycle those numbers for Captain Aero.