We did remove the Fleet Commander's buildability. The problem is the game was ignoring literally ALL conventional methods (prerequisites, script lockouts, even removing certain necessary tags), and the game crashes if you delete the entry. In the end we had to remove the Behaviour tag from it, which is why you don't see that happening, however it doesn't make the AI function any differently from when it had them. It's only a factor in a few GCs though, most notably Shadow Hand.