Irving and Aron's speculation about Elder Howard's intentions had some merit. However, the situation Howard and the Night Blades were currently facing was something that Irving and Aron could never have known.
After the battle in the ruins of Shadow City, Elder Howard and the members of the Night Blades suddenly found themselves in an even greater predicament. The power of the Werewolf God had become stronger than before. As time passed, the Werewolf God would be able to fully absorb the power of the blood moon. At that point, the Werewolf God might very well be able to venture into the Abyss of Death all on his own.
Realizing this potential threat, Elder Howard immediately shared his concerns with the other elders of the Night Blades. For the Night Blades, the Abyss of Death was of utmost importance. They could not allow anyone to enter it.
Although the Werewolf God was collaborating with Elder Howard, he was by no means an ally of the Night Blades.