Diesel has ever been an easy person to like throughout this series , he’s sarcastic and rude and doesn’t care who he upsets. When he’s found out of his head in a drug house Matteo has had enough so he sends him with Chase on a job in London. 
I loved the sarcasm between Zero & Diesel he finally met his match and it was funny when Zero left him speechless with his comebacks .
Diesels young life wasn’t easy his family treated him worse than you would treat an animal the cared for no one but themselves . Diesel has a lot of pent up anger with his family especially his mother who took his step father and stepbrothers side before his. 
I hope this isn’t the final book I’m trying to think who’s left of Matteo’s boys who might be getting a book but only the twins come to mind .