A bit late now, but ...
I was converting over some armies to the new lists and I noticed that the Wuqiujiu - clubmen are unprotected melee expert.
The DBMM army lists describe these thus:
The small state of Chungshan had troops alled wu-ch ' iu-chiu in iron armour wielding iron clubs "whatever they hit they smashed and wherever they went they met no resistance".
Unfortunately they don't give the source.
"iron armour" sounds like it should be at least protected and "whatever they hit they smashed" sounds more like 2HCC than melee expert.
Also if they were intended to compensate for lack of chariots by taking on enemy shooty chariots, protected 2HCC would make more sense than unprotected melee expert (vulnerable to shooting and no special anti-mounted capability). Even being superior they are worse against mounted than the normal average protected long spear infantry, and only marginally better against LSp infantry.
Is there other evidence that they were vulnerable to missiles and not that great in melee?