Originally posted by SpunkySmurph
But, they retconned Achilles' "gift"... this would lead me to believe that it applies to all showings.
It absolutely doesn't apply to all showings of Captain Marvel.
That's like saying Captain Marvel has never taken a punch from Superman, which isn't true.
More than likely, it deals with the new Captain Marvel, rather than Billy when he was CM.
However, even though Achillies is now the one who gives him invulnerability.... a change like that doesn't reflect on what Marvel did before becoming Shazam. That doesn't dictate a full out "retcon." A change in power, and a retcon are two totally different things in a comic. Hell, he as Shazam more than likely made it so that Achillies' "gift" was changed.