All I’m gonna write is based on italian RH list and 8th ed rulebook, so if in english version there is something different please correct me.
RH says that a CD hero may carry:
light armour or heavy armour and/or shield
additional hand weapon or great weapon
it also adds
a CD hero may carry the battle standard bearer.
ONLY IF HE CARRIES A MAGIC STANDARD CANNOT HAVE ANY OTHER ITEMS BUT L/A OR H/A
beacuse of the possibility of some BSBs in other armies to carry something that needs two hands (like shield for VC BSB) i looked on 8 ed rulebook pag 107 about BSB states rules… and nothing about equipment is write.
I asked to italian FIGW referees (but that’s valid only for italian federation) and they answered that about BSB I must follow what about tha army"book" (RH in this case).
so my question: could we have in 8th ed a BSB with GW?
(just to point something more: in the FAQ is written that an ordinary unit standard bearer my carry gw/ahw so why cannot a battle standard bearer do it if this is not forbidden by our list?)
As has been said, it’s because it specifically states in the CD army list that they may only take LA or HA that they may not have a GW/Shield. However, it doesn’t stop you from taking the magical paired weapons or an Enchanted Shield, etc