If one catches the imam in the last rak'ah, should he join him or wait for another congregation?

Question:
If I catch the imam in the last rak'ah, should I wait until he finishes the prayer so that I can join another congregation, or should I join him in the prayer?

Answer:
The answer, in detail, is that if he knows or strongly suspects that people will come and he is waiting for them, he should wait. If he does not know and has neither a suspicion nor a strong suspicion, he should join the imam to obtain the reward of following him. Yes.