SOMEONE was getting shafted in that finale. It was either going to be Grogar or the Trio
At least the reveal served a purpose. It shattered Twilight’s spirits and paid off discord’s weird behaviour throughout the season.
Shafting the Trio would’ve just made their entire arc a shaggy dog story to put over how awesome Grogar is.
And if you did neither of those, then you would’ve even more players bloating out the finale.