Yeah, this John isn't going to be heading to Atlantis anytime soon. It would never have the same affect here as did on our John, because there would already be an existing expedition that he wouldn't fit in to. Rodney's weird... obsession sounds too strong, but his whatever with the alternate-alternate-Sheppard would make it even worse. They'd all be either expecting a-a-Sheppard or thinking too much about Sheppard's past.

SG-1, on the other hand, happily accepts former First Primes and space pirates. That's clearly a sign as to where he belongs.