Here in the printer’s manuscript, Oliver Cowdery initially wrote “Aaron and his brethren”; then he virtually immediately corrected his brethren to those (there is no change in the level of ink flow for the supralinear correction). Spacing between extant fragments of 𝓞 supports the shorter those. Oliver probably wrote “Aaron and his brethren” because that phraseology had been used four times in the preceding text:
The unexpected “Aaron and those which were with him” was undoubtedly the original reading in verse 25.
Summary: Maintain in Alma 22:25 the corrected reading in 𝓟: “Aaron and those which were with him”.