So I own these 30k Dark Angel Cenobites I'm heavily turning into Grey Knights has my elite Paladin squad for my Draigo, who is also a custom character (Marduk Sedrus mini) they are the only ones who look like them and quite individualistic. When I talked to the store before I bought these guys from them, they were all for it and now a tournament is here they are advocating against me using them. Is this normal? I'm new to the hobby and most stores have told me has long as it's GW and clear what it is it's good to go. I might just have to sit out this tournament since can't justify buying Draigo and other minis at this time after buying other guys.

Am I just a foolish boy?