Q. See question above. In a case when in need a minyan was formed by including a minor, is it better to avoid the repetition of the Amida, that is some times done when reciting the Mincha prayer?
A. Poskim do mention that when the above leniency is used to permit the Avelim to recite kaddish, that just Kaddish and Borchu should be recited, the additional repetition of the Amida that we always recite, should be avoided, since the names of Hashem mentioned therein could be said in vain if the minyan is not proper. (Piskei
Teshuvos (O.H.55: 110 and others.
Rabbi A. Bartfeld as revised by, Horav Dovid Pam, Horav Chanoch Ehrentreu and Horav Kalman Ochs Shlit'a