From people directly and firmly connected to the Olympia? No.The special invite is fine, but nothing else. It would be a smack in the face to the other competitors (yes, the special invite could be seen as one too, but it has the potential to be a double edge sword for the invited competitor). If some supplement company offers him x amount of dollars to represent them on the Olympia stage, that's fine too.
Kai should take advantage of it. The old Weider guard is gone, AMI has bigger problems to worry about, the Olympia line up is lackluster, and the World has changed a good bit in the last few years. I doubt the "grapefruit incident" is as big deal now, even though it was just a half a decade ago.
Now's the time if he wants it.