Bellroc and Skrael totally could have won if they didn't revive Morgana. The Green Knight would have killed Merlin whether or not Morgana had been revived. Plus, the Guardians likely would've suffered a big loss to defeat the Green Knight if Morgana wasn't there to kill him. I don't buy that the Order only revived her to fix the balance. They had over 900 years to snag a Trollhunter's amulet to revive her, especially while Merlin was knocked out, but they didn't.
(B&S must be good employers to generously extend an ear to employee suggestions in the way they did) (are they unionized or do they have pizza parties) (do they even have dental?)
"In truth, it was our Green Knight who convinced us to return you."
You shouldn't have let yourselves be convinced then. You fools.