Tezos has been really strong after the announcement that Coinbase will be listing them. It seemed that after the initial 25% surge, bulls would have to face an inevitable pullback but it seems that bears weren't awake and bulls kept the momentum going.
But that happened 30 July. Do you think that is the case because of insiders trading? Coinbase announced today and not a week ago.
No, I think you're wrong the listing of Tezos on Coinbase Pro has been made effectively today (few hours ago) ...
but the official announcement of the listing was made one week ago as you can see on this article from Coinbase blog dated July 30