Snead was inconsistent with deep balls because that isn't really part of his game. And you can absolutely have a 4 WR set. Not sure why you think there's a limit of three for some reason.
We run a TE-based offense or going to, basically two TEs and three receivers max.
Thomas is gonna have his ups and downs with that schedule, he will need more than one chance in a game to make a crucial third down play. He's going to be relied upon to carry the team on his back in some games because of all the top corners Cooks will be facing.