Hello Alan,
there is definitely four missing; two of which (the first figure on top two lines and the flag-bearer) could possibly be part of a command set.
The one that a 'Forumner' described as using an anti-aircraft gun (third figure top two lines)could be part of a heavy weapons set.
The other, holding scimitar next to the flag-bearer, is anyone's guess.
I think the flag-bearer is the best of the masters.

As for the ZWB drummer I hope H will include him in the Sudan War British Infantry.
I know H was disappointed in his exclusion.
Just keep campaigning