Just because one or two sefarim mention a halacha, that does not mean that that is the halacha. We don’t follow all yesh omrim in the gemarah and we don’t follow every halacha just because it was printed in a book. The opinion may be valid, but that does not make it a universal halacha. It is impossible to follow every halacha brought down in the name of Reb Moshe while at the same time following all the halachas brought down in the name of Rav Henkin or even R’ Tuvia Goldstein, cause guess what, they had disagreements. Because you hold the halacha is one way, that does not necessitate me to hold of it.
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