Do spiritual ones sit closer to the front?
I don't know if I'd say spiritual, but I would say that the more hard-core and militant JW's sat closer to the front.
At least that's how it was in our KH.
They wanted to sit close to the front for different reasons.
I'm sure one reason was to allow the rest of the congregation to see how many times they raised their hand to answer Q's even when they were not called on.