I find it a little unrealistic if the personnel number reflected the faction size.
Say, if having 5 personnel meant your team is only 5-man strong, and no gyft at that... I don't know how they would've came into control of an entire area, much less multiple... (Not to mention the possibility of being a bare-stick commander after losing an attempt)
If these personnel had their own teams or 'outsourced' certain tasks... But then it would be unrealistic for a group to double or triple in size over 1-2 GM posts (which I don't think spans that long IC), when everyone has already an established faction
I just imply that my faction sustained losses prior to the RP which necessitated a rebuild. Losing personnel in attempting to take a district is reasonable. I'm not sure about upgrading though... kind of implies people are dying in the effort to improve conditions.