If it's built on association... her bond to her brother is the most powerful, but her memories of him were gone. As the one who altered her Soul into a pin, it's reasonable that I'd be on the list.

[Pause, and a slightly lopsided grin.] 'Course, there's also no reason ta think any of this's linear. They pick us out from points all over the timeline, so who's ta say the times when we arrive mean much?

Could be the magnet effect's based around somebody who got here in the middle of a group, or somebody who isn't even here yet.