With an army that, according to Appian, reached 70 000 following Vesuvius and 120 000 by the time he marched towards Rome, there is plenty of scope for these (and the coming set M077--to add to the hints); even if only part of these forces were former gladiators and slaves with captured Roman arms.
Aside from that the 'characters' in this set will suit a whole range of other ancient armies.
Strelets seems to be leading a new 'golden age' all by itself and we collectors, wargamers and/or modellers are the beneficiaries!
I wholeheartedly agree with your last point James, Strelets right now is turning out a lot of interesting sets with more always coming in the pipeline. They're really taking off and running while other manufactures seem to have almost ground to a halt, except maybe Caesar although they tend to focus on just one particular subject these days.