[Rizner]

I think that relying on one thing in particular isn't the best idea. Also, remember that if you train one human player to be the best, they can still get sick or injured (or just have an off-day), and they may not preform as intended. On the team I used to be part of we would usually have a human player, and a back-up human player in case something did happen and the original human player couldn't compete.

With everything being said, I think it is alright to rely on a human player you can count on, but also have a back-up plan or another way to do things if it doesn't work out.