Why did the Patriots make Cameron McGrone inactive after elevating him from the practice squad?

The New England Patriots elevated two linebackers from their practice squad to the active roster for their Monday night matchup with the Arizona Cardinals. But while one of them — veteran Jamie Collins — has made the game-day squad, the other has not: Cameron McGrone has been named one of the team’s seven inactives.

This begs the question: Why did they elevate him in the first place only to make him inactive? It is hard to know the team’s motives, but there are three basic theories why that might have been the case.

1. To increase his salary: Practice squad players who are elevated to the game-day roster get a one-week pay increase. Maybe New England moved him up to simply show him some…