Originally Posted by HandOfFate
IIRC, Wolverine did know, he found out Jean was alive in Uncanny X-Men 213 or 214. Storm didnít find out until Uncanny X-Men 240.
You should also keep in mind that when Jean came back the X-Men were still licking their wounds from their battle with the Marauders, hell a good part of the team were on the injured list. (IIRC)
That's my best guess.
It wasn't in Claremont's book, it didn't exist. End of discussion.