6 recruits, 6 champions. Makes sense to hold off, unless the king didn’t intend to have the little prince in the arena. If so, then the recruit from the royal delivery would fetch the 7th champion.
Little prince must've hated the red king because he is a member of the red kings family and he literally just decided to betray them and become a champion for the blues
Wait if you see carefully the knight was wearing blue clothes and little prince get the paper he was thinking his dad red king invinited it to fight his brother blue king
what da hell... this little prince and his creepy knight could never defeat carts like this that gets shown wtf.... even dark prince ALLONE kills this little prince easy
So my guess is with the monk animation, the goblins wanted to take the letter and have the 5th champion be a goblin. Big question is who was recruit #6 trying to give the letter to.