I am managed by the assistant head, it make decisions quicker as they come form the top to start with rather than having to go up the tree and wait forever.
It would be very difficult for any curriculum based person to manage a Network manager, unless they are a very good manager and trust the netwrok team to do their job for the simple fact that every ICT teacher I have come across and not very technicial, and only understand what they teach, and like to play with new toys and techniology to make it look like they are keeping up with the latest trends.
just my opinion though...