Given that SR and earthdawn are now owned by separate companies and SR has made a move away from Earthdawn connections in recent years, I think this is a really big leap. (legally speaking)
As to what the stone actually does? that might come up in a later book or mission.... many of the artifacts recovered required very specific rituals to unleash their power... Knowledge that you can either use to keep the stone as a mysterious trinket, or let your imagination run wild and have the ritual unlock some fantastic ability.........
I don't see it as that big of a leap. It is presented in the section of Parageology that discusses
True Elements, also another Earthdawn Port.
excerpts...
[spoiler]
.who specializes in pre-Awakening magical artifacts . . . a shard of obsidian. . .theorized was a piece of a larger stone she found references to called a “morel sael,” or morel stone. Unlike most magical artifacts, the item doesn’t have a magical aura. . .appears to have a faint aura similar to that of living being, hence the Sperethiel name for “Life Rock.” When compared to primal stones, there are similarities, but the morel stone is a natural formation and of such a large size that it implies that it is not a derivative of longpi.[/spoiler] longpi being the sperethiel (I guess) for True Earth. So, the Earthdawn link is not much of a leap at all.
Unless you mean the hinting of Obsidamen. In that case, yeah, I doubt it'll ever happen, unless particular GMs want it to happen, but this section of the book deals with Earthdawn material brought forward into the Shadowrun universe.
But, Parageology doesn't say the morel stone
does anything, it's just an artifact from another time...