@PureHeroine@Cerces22 While Aloysius would never say no to a new member, Lana is a captain. While Zeke us just a member. Aloysius knows enough about the Guild, so flipping a member wouldn't do much except bolster the numbers.
The Dark Shadow can't fight against the Guild in a one on one situation. It relies on secrecy and deception to evade the Guild. Losing Lana would blow most of those secrets and for a short while, the Dark Shadow would be extremely vulnerable. Lana could spill where the headquarters is. If Salem decided to go in for a frontal attack... Well, there wouldn't be much of a Dark Shadow after that.