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Our Daf relates that Rav Yitzhak bar Yosef once found Rabbi Abbahu standing among a multitude [okhlosa] of people, and he said to him: What is the meaning of our mishna?
Jastrow has many meanings of okhlosa which leads us to the Tosefta: One who sees multitudes of Israel recites:
"Blessed…Who knows all secrets.” And Ullah’s remark: We hold there is no multitude in Babylonia.
Implying there is no reshus harabim in Bavel. We look at the travels of Ullah…