Gino has lived the game inside and out on all facets of the game on offense, on defense, and on special teams, and as a coach of the team. He has done it since the start of the Patriots and knows what the hell he is talking about when he talks about a play. You won't find anyone out there in the NFL who has his chops let alone his abilities on air.
Santos knows how to describe the action, when to shut up and let Gino do the commentary, and what to add to conversations about plays that aren't forced to kill time.
There is a reason why Gino and Gill have been working together for most of the last 39 years. The two are some of the greatest football announcers ever.
They know what the hell they are saying, they know more about the game and are clearer in their descriptions and quick on the action. This is preseason, nobody is going to know who every single player on every single down for both teams are especially guys who won't be there in a couple of weeks. When they start making huge mistakes on air during regular season games then you can start this talk but this was during preseason!!!