Which organism is generally LEAST associated with early/initial gingivitis, being more classically a marker of established, more advanced chronic periodontitis instead?

Tannerella forsythia is part of the 'red complex' (along with Porphyromonas gingivalis and Treponema denticola), classically associated with established, more advanced chronic periodontitis rather than early/initial gingivitis. Fusobacterium and Prevotella are more associated with the 'orange complex,' appearing somewhat earlier in the ecological progression from health toward established disease.