At the end of tosfos it asks and answers the same question that the gemora asks on daf 21 amud alef 12 lines from the bottom - whats the chiddush of Tosfos?
Eli, Manhester
You are in good company, since the 'Hagahos ve'Tziyunim' (in the Oz ve'Hadar edition of the Gemara) makes the same comment as you. Presumably then, Tosfos were merely quoting the Gemara when they made that statement. Perhaps the words 'ke'de'Isa le'Kaman' were omitted from the text.
be'Virkas Kol Tuv
Eliezer Chrysler.