Eretz Yisroel Grains

The Mishna Menachot 62b says that the שתי הלחם ועומר can only be brought from grain of Eretz Yisroel. The Gemorah on 69b discusses (according to Tosfos) can one bring the שתי הלחם  offering from grain that came down from the sky as a miracle is that viewed as being considered part of מושבותיכם or not.  However, even if its considered מושבותיכם, the clouds don’t have the kedusha of Eretz Yisroel so how can the grain be kasher?  It would seem that the grain doesn’t have to come from kedushat Eretz Yisroel, it must come from the place of Eretz Yisroel.  However, the Mishna in Kelim (1:6) says that Eretz Yisroel is holier than other lands for ביכורים שתי הלחם ועומר is brought from it.  The Rambam in Beis Habechirah (7:2) cites this Mishna.  It seems from here that it is a din in the kedusha of the land.  So is it a din in kedusha or the place?  (See more about this here.) (See Mishnat Rav Aharon Zeraim #14 and #19.)

 The Gr"a in the Eliyahu Rabba takes out bikkurim from the Mishna because its not a law in the kedusha of the land, rather a מצוה שתלויה בארץ.  However, the Meorot Hagra includes it.  See Tosfos Babba Basra 81a.  Tosfos Menachot 45b ד"ה קרבו says that we learn that the שתי הלחם doesn’t apply in chutz laretz from bikkurim.  Its clear that Tosfos holds that the reason there is no bikkurim outside of Eretz Yisroel isn’t merely because it’s a מצוה התלויה בארץ but that it requires kedushat Eretz Yisroel (Briskor Rav.)