Expert in all Areas

Rabbi Yehudah ben Beseira Daf Yomi Kiddushin 10a sent back to Ben Bag Bag: You do not hold this way? I understand that you are an expert in many areas of the Torah. Don’t you know how to derive a kal vachomer?

Why must he be an expert in many areas of the Torah in order to expound a kal vachomer? Isn’t a kal vachomer based upon logic?

Reb Elchonon Wasserman cites from Reb Chaim Brisker who explained as follows: One need not be an expert to expound a kal vachomer; however, the kal vachomer might be refuted from another area of Torah. In order for one to expound a kal vachomer that will not be refuted from anywhere else in the Torah, he must be an expert in all areas of Torah.