Yeah, Freya and Cecil are ahead of the others, while the WoB group is lagging behind; This I agree with. It is highly unlikely they could all be attacked at the same time, considering they themselves aren't in the same time.

Maybe it'd be wise for Mateus to not trust Marche with that just yet; As he is a child who he isn't completely familiar with, after all. No need to risk the wrong words slipping until Marche was lacking a bit in the soul department; Enough so that his personality starts to shift somewhat, to where Mateus can put more faith into him rather than risk having him screw something up. I think having Marche partake in the attack against Freya and Cecil would be a good idea; Mateus could grant him his power and send him off to give it a test run without risking his own plans. Marche would consider this a step towards saving his world, so he has plenty of reason to go on the mission. Aside from being a bit confused about her situation, Freya is fully capable and able-bodied for battle at the moment; So perhaps Marche's general experience compared to the adults will balance things out as they can probably outsmart him until he starts improving and straight-up getting stronger; The Hell Dragoon will be the real threat in the battle; After Marche is taken care of, probably in a 1v1 with Cecil while Freya attempts to hold off the Dragoon, they can focus on the Hell Dragoon and finish it off. 

Then after the fight is over, there can be a small amount of talk between the two sides of the conflict, before Marche is pulled out for the sake of not revealing anything important, or slightly less harming to Mateus, him getting slain.

In this situation, you should control the Hell Dragoon for the sake of us being balanced out; One hero and one villain each. Though in different situations down the line, for balancing purposes, I may take up one of the Hell Knights depending on who is in control where; For the sake of nobody fighting themselves, or something stupid like that. So for now, no, I won't control the Hell Dragoon; But in the future, I might control one of Mateus' pawns to balance out the combat roles between us as roleplayers.