Good question and one that may only be answered if you fill out the NPC both ways and see the difference with and without the non-custodial stepparent - IF Columbia’s NPC is even advanced enough to handle that.
My kids’ dad and I are divorced and he earns significantly more than I do. D’s financial aid award is not as high as it would be if I were the only living parent, but it is not as low as it would be if he were. It’s sort of in between and if i wanted to reverse engineer that i could probably figure out how they weight his income.
Maybe you can do that with the NCP-step.