It is important that a Brisker Chakira should make a difference in halacha not just the Rambam whom we don’t always follow. An example is the meaning of שומע כעונה. If it means that ir makes you speak, the problem is , how can you be yotze megilla when you don’t have one personally? We must say that your speaking from the mouth of the baal koreh who has a megilla, so you don’t need one yourself. They say that the kohen can be motzei another kohen in duchenen but he must also raise his hands. Raising the hands is a physical part of the mitzva whereas holding a kos is not. So you don’t need a kos to be yotze kiddush from someone else.
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