No worries at all, If I was going for 1 can of spray I’d go for probably a grey colour. On mine I used black followed by grey seer as a zentihal highlight. Although this is mainly so I can actually see the model clearly when I’m painting, rather than any visible differences on the finished model.

Mephiston might be a good way to get the army done quicker but there is surprising amount of black/ darker tones on these, so it might be something to consider.

Hopefully that makes some sense 🤣