I think the 12th man came about for various reasons.
One the I can think of also is the game where the ref asked the crowd to quite down so they could here the play calls, and the ref said we will give the bills a 15 yard unsportsmanlike penalty. Which there is no rule for. The crowd got quite for a second then got louder than ever. Ref asked for quite again and the crowd got so loud they just continued. The players were clapping 👏 at the crowd.
It was during the Kelly years. Someone here will remember that game.
I just remember when I got home
E I could not here much for 3 days.