Maybe it was just me but I have always figured that CON was going to be the WHM seeing it has the Cures, Buffs, Silena etc... CON seems to be a mix of WHM and RDM when comparing spells. Now with all the advanced Raise spells it's going to get it even feels more so like WHM.

THAU to me always seems more a mix of RDM and DRK with all the absorption spells, dia, and such that it had. So I always figured it was going more the BLM route... also looking at some of the spells

CON R1 = Spirit Dart (Light Element Attack)
THAU R1 = Phantom Dart (Shadow Attack)

CON R10 = Radiance (Sear an enemy with celestial brilliance, dealing astral damage.) Light Side
THAU R10 = Damnation (Haunt an enemy with visions of the hells, dealing umbral damage.) Dark Side

Also CON gets:
Resonance 26 = Incant in a sonorous tone
Roaming Soul 30 = Cast in an echoing hum
Profundity II 34 = Enunciate and project

Seems to me to be more calming magic, where is whispering, speaking or talking... more light side.

Thau gets:
Initiation 22 = Bestow your strengths on another
Paradigam Shift 30 = Amplify your voice
Blood Rite II 34 = Spill your own blood in a sacrificial rite

Seems to me more, yelling and sacrificing.. which tends to be more towards a darker side especially sacrificial rites.

Also:

CON: Nature's Fury 40 = Using nature and launching an elemental attack

Vs.

Thau: Shadowfall 40 = Using Darker magic and launching a shadowy attack

etc... etc... etc...


I have personally always felt that THAU was more towards the darker side, while CON seems to me more towards the light and nature side.