Heino had sent the three Light faction members to deal with Raze. Knowing the full effect of their power and the strength of the Light faction members he believed that it was enough to deal with him.
Although Raze might have defeated the three Deleters that had been sent out, he had done so during the attack on the Demonic faction, Heino also knew that there were still a large amount of powerful demonic Faction members.
Which is why he never even thought about just sending one Deleter to deal with the Dark Magus and the others. To be honest, he didn't think the members of Alter with their artifacts and the Light faction Clan leaders were necessary.
It was a little overkill, but the Dark Magus was here right in front of him. Heino's blood was boiling and he wanted to deal with the Dark Magus, no matter what the cost.