Let me start by saying this:

1) If it's Sheriff McAllister, I'd be dissapointed. We haven't seen him since s1 e01 - as much as he was a hardcore creep to Van Pelt... no. 

2) If it's Reed Smith...wait...who's Reed Smith?

HOWEVER, I could honestly see the rest of them (with, or without Partridge) being connected. Stiles runs visualize, of which Ray Haffner is a member. Kirkland and Bertram have a connection through the promise between Kirkland and Minelli to stay in touch about the case. They're all high-rank individuals, in one way or another.

Not sure about Partridge. He's no mastermind - he may be another tool, though.