No they won't.
I also applied out of a gap year (I only hit upon the idea of studying in the USA at the beginning of my senior year and I had to take a gap year anyway because of military obligations in my country).
More and more US colleges, especially the most selective ones, allow or even recommend (like Harvard, for example) their admitted students to defer enrollment for one year. So I don't think that colleges have a problem with gap years. Also, I asked the regional admissions officers of some of the colleges I applied to, and they all said that it's definitely possible to apply out of a gap year. Apparently many successful applicants have done so in the past, especially internationals.
I don't think that activities during the gap year can help you a lot though, if it isn't something TRULY stellar and unique (Nobel Prizish, at the least
). However, my gap year was always a good topic for all of my interviews. I think a gap year can be something great and very valuable even if it doesn't help in terms of college admissions.
Now, I second some posters before me that all colleges on your list are very selective. If I understand you correctly you assumed that you, as an international asking for aid, will have bigger chances at need-blind schools like HYP & MIT. However, this is only a myth. While gaining acceptance to those schools is a lot more difficult for students who don't need financial aid, it is NOT easier for students who do.
Even though it's almost impossible to find safeties (or even matches) for internationals asking for aid, I would strongly recommend to add less selective schools to your list. But check whether they award fin aid to intl's and whether they guarantee to meet 100% of your need.
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