De Luca isn’t Swiss-born, so that can’t be the probably. His toolkit is kind of just average overall, with no real standout attributes, which always hurts guys. But there’s no way there are 223 better players than him in this draft. Without a doubt someone should’ve picked him.
I mean he spent most of his junior career in Switzerland, so I think that counts. Sure he hasn't a standout skill but as you said yourself we are not talking about getting picked in the first three rounds but about getting drafted at all. I am just noticing that prospects affiliated with Switzerland that are not blue chippers like Bichsel or Reinbacher but should be good enough to get drafted seem to get overlooked on a regular basis now. Knak (2020), Rochette, Canonica, Biasca, De Luca etc. I don't know if there is an actual bias there in the scouting community or if its just a coincidence, but I find it noticeable.