What do you think would Kol overpower the Marcel's army as Klaus did ?
We also got to take into account on how skilled said vamps that are fighting. The ones Klaus fought were supposedly made up of Marcels best fighters. That was part of the reason they managed to get the upper hand on him. Similar thing with Rebekah vs members of the Strix. Rebekah(supposedly) easily took down most of them. Yet struggled against Aya(a very skilled fighter).