Based purely on conjecture, I'd be inclined to say he was a lone wolf – who maybe manipulated one other person on the resort into helping him, but not under the guise of abducting a child.
Money isn't a factor that motivates CB. If he's a serial killer and sexual abuser as suspected by the German police, what motivates him are his sadistic sexual fantasies.
He fits the mould of a semi-disorganised serial killer – unable to hold down jobs, relationships, possessing drug and alcohol problems, etc. Also his gaunt physical appearance is fairly telling.
While there's an element of organisation to his MO, he's ultimately driven by impulse and desire. Any wider 'ring' he's part of or involved with, would, to my mind, be online only – sharing images, videos, etc.