Related for Ketubot 122:16

צריכא דאי איתמר בהא בהא קאמר רב משום דלא אפשר בפרנס אבל בההיא דאפשר בפרנס אימא מודי ליה לשמואל ואי איתמר בההיא בהך קאמר שמואל אבל בהא אימא מודי ליה לרב צריכא:

[Both disputes are] required. For if [their views] had been stated in the former, it might have been assumed that only in that case did Rav say his view, since [the appointment] of an agent is not possible but that in the second case where [the appointment] of a agent is possible he agrees with Shmuel. And if they had only been stated in the second case, it might have been assumed that only in that case did Shmuel maintain his view but that in the former case he agrees with Rav. [Hence both statements were] necessary.

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