Is it permissible for me to follow a latecomer and make him the imam?

Question : If the one who is in doubt stands up to complete the prayer with a fighting shaykh, and then another person enters, is it obligatory for him to stand up with me?

Answer : No. I mean, if the latecomer stands up to make up what he missed, he stands alone, transitioning from following to praying individually. It is not from the Sunnah for anyone to join him, nor is it from the Sunnah for him and the one who was present with him to gather in congregation. However, the jurists said that it is permissible, and some of them said it is not permissible. No, it is correct that there is no harm in it, but leaving it is better.