Do The Clothes Make The Man

Rav Yosef Engel (Esvan De’Orasayeh principle 19 and in Beis Haotzer) has a chakirah if a kohan that serves in the mikdash without the בגדי כהונה is it a problem in his service or is the problem in the kohan חסרון בשם כהן או חסרון בעבודה)?)  The Gemorah says when the Kohanim are wearing garments, then they are considered Kohanim, if not they aren’t considered Kohanim (Sanhedrin 83b and Zevachim 17a.)  The language of the Gemorah indicates that there is something lacking in the kohen.  However, there may be a possible lacking in the service as well. The Briskor Rav (Zevachim 18a) asks why doesn’t the Rambam count the mitzvah of the garments of a kohan as two mitzvot, one for a regular kohan and one for a kohan gadol?  He answers that the garments are a mitzvah vis a via the avodah, not the kohan wearing them, hence it is one mitzvah.  

 

Rav Yosef Engel brings a Or Hachaim that asks what is the Torah teaching by saying the garments are עָשִׂ֥יתָ בִגְדֵי־קֹ֖דֶשׁ לְאַֽהֲרֹ֣ן אָחִ֑יךָ לְכָב֖וֹד וּלְתִפְאָֽרֶת, just say the commandment to make the garments?  The Or Hachaim answers that it teaches us only kohanim have to wear the garments however, when Moshe served in the first seven days of the mishkan he didn’t have to wear the priestly garments.  Clearly, he understood the lack of the garments is merely a problem in the kohen, not in the avodah.  However, Rav Yosef Engel asks how can the Or Hachaim derive this law from this verse if the Gemorah in Zevachim 18a learns from here that ripped garments of kehunah are disqualified.  So, what’s bothering the Or Hachaim if the possuk is used for a drasha already?  I don’t understand his question.  The Or Hachaim himself brings this drasha on the possuk 28:40  וְלִבְנֵ֤י אַֽהֲרֹן֙ תַּֽעֲשֶׂ֣ה כֻתֳּנֹ֔ת וְעָשִׂ֥יתָ לָהֶ֖ם אַבְנֵטִ֑ים וּמִגְבָּעוֹת֙ תַּֽעֲשֶׂ֣ה לָהֶ֔ם לְכָב֖וֹד וּלְתִפְאָֽרֶת, he is bothered by the same language in possuk 28:2.  The Or Hachaim is bothered by the repetitive language.  That’s why he needs both the drasha and his commentary.  What’s bothering Rav Yosef Engel?