NFL injury reports are given on a game by game basis. If a player is listed as 'out', they are out for the team's upcoming game. A new injury report will be created for the next game and possibly that player's status will change and they will be able to play.
There is no player named William Dalton listed in the NFL's player data base or in the historical player database.
The NFL has a 'rating' system for injured players that specifies their probability of playing in a game: 1) Out - the player will not play 2) Doubtful - 75% chance the player will not play 3) Questionable - 50-50 chance the player will play 4) Probable - 75% chance the player WILL play
Yes, an NFL player needs a lot of practice to play.
NFL player Will Yeatman played for Maryland.
NFL player Will Ta'ufo'ou played for California.
NFL player Will Beatty played for Connecticut.
NFL player Will Hill played for Florida.
NFL player Will Murphy played for Oregon.
NFL player Will Compton played for Nebraska.
NFL player Will Pericak played for Colorado.
NFL player Will Rackley played for Lehigh.
NFL player Will Svitek played for Stanford.