That would be my guess as well... If the Lite did exactly the same thing as the original, what would be the incentive to buy the more expensive.
Having the ability to dock, but not having a dock would still make the difference between the models. Nintendo could sell docks separated in this case.
duduspace11 "Well, since we are estimating costs, Pokemon Red/Blue did cost Nintendo about $50m to make back in 1996"
Mr Puggsly: "Hehe, I said good profit. You said big profit. Frankly, not losing money is what I meant by good. Don't get hung up on semantics"