You’re not too far out with that theory slope 🙂 As one of my mini games I have started trying to destroy every building on dr-t and imitation game. I noticed (purely anecdotally) in my npc mini game of bullit destroying every building that I seemed to get more Powerstones.
With the npc bases I can destroy every building with consistent conditions, ie no losses, no gbe left, no buildings left and it appears that I get more power Stone rewards than when I zooka the core.
I remember reading your power stone chance works on the number of buildings destroyed but it is a very small chance. So it got me wondering if it was literally the number of buildings you destroy DURING your attack rather than the number of buildings the base has if you win.
Probably nothing but it makes the events and npcs more interesting for me 🙂
Edit in fact the wiki specifically says that this does not affect your power stone chance but we all have our foibles 🤪