Not got all of my pioneer players in FC24 that I got in FC23

You may have confused normal Founders and Pioneer players.

Pioneer players are the ones with the triangle point things at the edges of the card.

You're saying you've had 50 - 60 pioneer players? Nope, that's normal founder players without the triangles at the edges of their cards.

That's why you thought you had a lot of pioneer players. Hope this helps.