They arent Kemmler's creations.If not the scene, then the bound bird spirits. They were bound by Kemmler, and are held from their final rest by Kemmler's (false) promise. They are, in essence, Kemmler's creations.
They are independent creatures that heeded his summons and which he bargained with. But he didnt make them, and I dunno how relevant they are to him as a link.
Besides, if we're really interested in Kemmler, we'd go talk to Old Man Mathews.
Or check out all the places where he was killed(they killed him seven times. Each location will have significance.)
For clarification:The spirit in front of you is a focus that could be used to find out stuff about Kemmler, the scene could be used to find out more about said spirit
When you say spirit, are you talking about one of the billions in front of us, or are you referring to the collective as one spirit?
Because I'm averse to burning a near-Incarna as a focus due to curiosity about a guy who is Super Dead and gone.
Especially since there are other foci about Kemmler.