Are you referring to all companies, or just the two depot companies? Would the men from them be distributed among the field companies? That would be understandable.
I take it from Paskal’s other posts that he’s interested in the conditions at the time of the Sikh Wars. In looking at the returns, it appears the numbers in the field in India were higher than the c. 600 Grimheart cites: the average is around 800 per battalion (a few were higher). That would seem to imply more than six companies, but I can’t find definitive information.