I can only go by proof provided. So, if none is provided, I discount any claim that from my experience I believe is in error.
I can't tell you of a single ticker that came off the greys to be one of the biggest runners of all time.
In fact, offhand, I can't tell you of a single ticker that came off the greys. Not that a few haven't. Just that such a rarity escapes me at the moment.
You can lead a horse to water. But you can't make him get down on one knee and do an Al Jolson impression!