I'd be content with some sort of markers/symbol on the primary unit making it stand out from a solo unit.
They really should have combined units display more than one model. I thought that was the whole point of having fewer models to begin with.
I like the concept but fear that if it is mandatory that combined units have separate graphics, that this might inhibit modding since not many modders are up to creating graphics mods from whole cloth. I'd be content with some sort of markers/symbol on the primary unit making it stand out from a solo unit.
But we also need to know how combat works with stacks. If its like civ4 where it remains 1v1 battles then a marker to indicate how many unit occupy the tile may be enough.
It is a combined unit with higher strength than the original single unit it replaces, but less than the individual unit's combined strength.
Only tough part is telling them apart without the tooltip. Remember the change in art style was supposed to improve first glance readability, not have me guessing where fleets are in regards to my single ships. I personally hope they add another ship to the fleet model so I can tell at first glance. Still it makes no sense that a fleet would be less effective than a single ship... Usually more ships could take down single ships due to them out manuvering them...
The combined Support units look fine, showing all models of both units, so it's disappointing that combined military units don't do the same.One video had Boudicca stacked with a unit, and all figs, general and warriors, were in the combined unit... so great generals at least work okay.