Well, the series is quite dark so I definitely think it's a possibility. While sane Lubbock would never do such a thing, can we really say the same about an insane Lubbock? And Syura really seems to be pushing him into that direction. He's making it seem like Tatsumi left him for dead while he is being tortured. Syura is combining physical and mental torture into one melody and it seems to be working just fine considering that judging from the last page of the recent chapter, Lubbock is already starting to lose it. And that was just level one torture. The higher levels of combined mental and physical torture should be capable of pushing Lubbock to insanity at which point, that version of Lubbock might actually join Wild Hunt.
And what's more, Wild Hunt has been restoring it's power and it's almost back at full power. They lost Cosmina, Champ and Enshin, but now they are reviving Cosmina and Champ has been replaced by Suzuka so right now, they're missing only one member and considering it's possible for Lubbock to join, they'd be back at full power. More so, Lubbock is a pervert and oftenly has fantasises about women, so if Lubbock were to go insane, I'm pretty sure that part of him would get more twisted and extreme, possibly turning him into a rapist which fits Wild Hunt. And lastly, he's oftenly shown jealous of Tatsumi so I think there'd be kind of a parallel if he became Syura's personal pet with Tatsumi being Esdeath's personal pet.
Though, that's just my opinion.