Prologue
So this is based after the prison war and is indeed a what if scenario based if the governor and his army had won the war. Daryl was bitten by the walker that was behind him before he was able to put the grenade in the tank; therefore the tank is still in good shape.
Everyone's Status After The Prison War:
Rick's Group:
Rick = Dead • Carl = Dead • Judith = Alive
Daryl = Undead
Michonne = Dead
Maggie = Unknown • Beth = Alive
Glen = Dead
Bob = Dead
Tyrese = Alive • Sasha = Dead
Lizzy = Alive • Mica = Alive
Governor's Group:
Phillip/Governor = Alive
Tara = Unknown • Lily = Alive
Mitch = Alive
Alisha = Dead • Ross = Dead
Rest of the Governor's Group = Alive
Others:
Abraham = Alive • Eugene = Alive • Rosita = Alive
Carol = Alive
Claimed Group = Alive
Terminus Group = Alive