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I think what Hello is trying to say is that in the linked comic (in a contrieved sort of way), Webby said there were some secrets that when missed could not be gotten back to.  Some secrets like the fact(?) that Argent, after leaving the tree was taken back to his own timeline, to his own world, as if he had never left.  There he lived a happy life with his family.  And then after many years passed the heroes paid their respects...

Wait that doesn't make sense.  The stone says Argent - not his real name.  And the heroes (if they really couldn't come back to missed secrets), shouldn't have been there.

Heck, I'm overly delusional and my own nemesis.