Possession is like troop numbers in battle its good to have but not a guaranteed win.
that's a nice metaphor.
Mine is :
if there was a bookmaker in t11 and gathered all the data -
-quality of the players
-proper formation
-condition and morale
-win bonus
-bonus from tickets (home or away game)
-bonus from supporters
-presence of the managers
... then he would give some % of the team that can possible win the game.
That's for me is the ball possession .