Hero classes' unique equipment

[Yvain]

There is no such possibility And If there is a situation like you mentioned, only one zwei has nothing to do. Generally there should be even moar zweis than RGs...

Nothing to do ? Damn, you have not understood what are hero class... Royal guards are better at shielding, and zweihanders are slightly better at slashing. But they are still good commandos with at least 8 in shield and 8 in power strike. Every commando hero class is interesting and will always be useful near the shieldwall... Pikemen just have to check if any commando needs a place to slash, since they usually have shorter slashing weapons.
Sharpshooter hero classes ? Chosen Marksman if you really like crossbows, Pavise Champion is an excellent choice if you like flexibility. Aventurier if something interesting for them is coming in next patch