Yeah, seriously. We can talk about statistically likely things, but crazy and improbable stuff happens all the time. Any creep could've fixated on Nancy at any time, for any reason. We still don't know exactly how or why BK ended up fixating on his victims.
I just hope there's some concrete evidence somewhere along the way, or someone ends up talking for the reward. Savannah said people could call the tipline anonymously. There's no reason for someone to stay silent if they suspect who could've done this. Let's hope they're moved to report him.