He should never have been put in the house ... he functions only through attachment with other people ...
Phase 1: sharing a bed and all his time with Vanessa. Relationship stopped after an incident where the mutual appreciation/reliance ended with a throwaway remark from Vanessa, where she intimated The Craig ranked low among the 'looker' stakes to other male HMs; he never forgave her the betrayal of something so ostensibly insignificant.
Phase 2: Moves from Vanessa to attaching himself limpet-like to Lesleh. Co-dependency works much better. They are both equally mean-spirited, insecure, bullying and vile. They'll avenge the injustices heaped on them by the world in not thinking they are both wonderful with barbed tongues unleashed in unison.
Phase 3: Lesleh evicted ... The Craig is alone again with the cold dark night of his own twisted soul. He needs to find another attachment. He moves to Maxwell/Saskia. This time there is no co-dependency. The Craig adopts the role of gimp/playtoy. He doesn't expect that Saskia/Maxwell should reciprocate his love/worship. He gives all the impression of a guy who got with the 'cool' kids and doesn't, deep down, believe he's worthy to be among them. This time to be allowed to worship is enough for him. At least, he's not alone with himself.
Phase 4: Maxwell and Saskia gone, he moves to full-on attachment to Anfernay. He starts with the same worship as for Saskia/Maxwell, without expectation of it to be reciprocated. But Anfernay is a weaker, more easy-going character than Maxwell/Saskia ... maybe, one of the 'cool' kids he doesn't deserve to be with in his mind can be turned to worshipping a little back ... if The Craig tells him enough times just how much the object of his worship he is ... how he'll never have another friend like The Craig who will lay down his life for him, and only thinks of him every waking and sleeping second of his days.
He's one seriously messed up kid, brimming with spite and self-loathing, and confirms for me at least there's no such thing as proper pre-show psychological screening of participants.