On A Police Chief's Imagery

As the case involving Wendy's, chili, and an unknown finger comes closer to its denouement, San Jose's Police Chief has an interesting way of putting things:

"The jig is up. The puzzle pieces are beginning to fall into place, and the truth is being exposed," Police Chief Rob Davis said.

Is it that police cases always involve a conceptualization of pieces coming together, or is it because this case was about a finger piece that the Chief talked about it like this?