I'm so gonna get flamed for this... (System rant!)

I don't really know how to start this, but whatever... To keep it short, some of my fictives are looking for sourcemates...! Specifically Abbie. I usually vouch for source separation within my system as it helps keep things neat, but yk it isn't something I can exactly force either, as it would only complicate things further...

Anyway, I am sorta looking for advice? Should I let them search for sourcemates, or try something else that might work...? If I'm being completely honest I am still trying to get my head around all this system stuff, so any advice will work just fine. Thanks!