I'm going to preface this by saying that Kairos looks cool, is probably better than all previous starting LLs, and I like the idea of the starting LLs being simpler than DLC/FLC. HOWEVER, he does not have a mechanic- not matter what CA says.
This is what an actual mechanic would look like:
- Kairos gathers fragments on the campaign map (maybe by taking settlements like Thorek)
- He can give these fragments to himself or to other Exalted Lords of Change
This might force you to play a different way (eg by prioritising certain settlements to occupy) and impacts multiple armies (not just Kairos).
This is Kairos' "mechanic":
- Kairos puts a skill point into a fragment
- Only Kairos gets it
How is this any different to Mannfred/Teclis getting different spell choices than other characters?
Again, I'm happy with Kairos- but what he has is not a mechanic.