So what's Tosfos question? Tosfos is giving us a case of Mitzri Sheni and now we have two anwsers, Tosfos and the Meiri
Myer, Monsey
The Maharsha indeed asks that perhaps we do make the Zomimim into a Mitzri Sheini. The Chidushei Rebbi Akiva Eiger answers that Tosfos understood from the Kal v'Chomer of Bar Pada that it would also apply to a Mitzri Sheini (see his reason why at length). (The Ritva and Gevuras Ari give other answers to this question.)
All the best,
Yaakov Montrose