In order to clear room for tight end Asante Cleveland on the active roster the 49ers departed with Johnson. The move leaves Blaine Gabbert as the only quarterback behind Colin Kaepernick.
Not much should be read into this from the quarterback situation as Johnson has failed to stick with multiple teams over the past handful of seasons. He will join a group of players who roam around the league for tryouts this year. The 49ers season lives and dies on the health of Kaepernick.
The important thing is that the promiton of Cleveland from the practice squad means that either Vernon Davis (ankle) or Vance McDonald (knee) have health concerns this week.