CBS Sports pundit Charlie Davies has said one Inter Miami youngster is now keeping up with Lionel Messi in training. The Argentine international has been a revelation in Florida since arriving last year, with Messi guiding Inter Miami to the top of the MLS Supporters Shield standings and doing so with some fantastic performances. With Inter Miami currently on a five-game winning run, the Herons are picking up important points before the Copa America break that will see Messi and a number of other key players depart for the month for the summer tournament. And one youngster has really caught Da…