I guess we better take the reportings of mr "contract guilty" with a grain of salt, but this looks a bit like Köln act like they have nothing to lose.
I obviously know next to nothing about thse guys, so I'm just making very superficial observations, but:
Kohler's CV looks quite interesting for a 32 year old, but as far as coaching seniors goes, he can boast of lasting less than 6 months at two random minnows.
Stamm at least had one very good season with Freiburg's second team, but this season he's even outdone Kohler with 9 points from 20 games.
Henriksen though looks a lot more reasonable, based on my very thorough 2 minutes worth of research.