One of the things he needs to fix in the mothership power is having the amount of cash we have on us effect our power rating. Cash does not equal an accurate power rating really to me since some people like to sit there and just hoard the cash. It doesn't do anyone any good if it ain't being used.
If cash didn't give off power then whats to stop Kyle from powering down to where you are using smaller ships and then attacking you? Cash effecting power is the only thing that can stop him from doing that right now.
It would also mean we could all have a go at him too if he powered down to try that. though I have noticed cash doesn't have as big of an effect as I thought. Seems that even when you got fleets tucked away they still count a little towards your mothership power lol