95 Zach martin set in mut25

So I have Kyle Pitts and davante adams, I submitted both in the Zach martin set and it says 2/8. Now I calculated and saw it would be more profitable to sell both and just buy him rather than completing the other 6 in the set. However when I go in the set, it doesn’t allow me to remove them from the slot, I even went on the companion app and nothing works. Idk if someone has experienced this, but would really like any type of help since they’re worth around 400k and I’m missing 300k to get my RG. Ty