the meaning of "only some students"

The following is an excerpt from a CNBC article.

What does "only some students have to worry about what that means for their chances" mean? Who are "some students?" Are they legacy students or non-legacy students? Legacy students account for about 30% and non-legacy students about 70%. I'm having trouble interperting the word "some" in this context.

"Top schools now have record low admission rates, but only some students have to worry about what that means for their chances. Legacy admissions, at elite institutions especially, put a select few at a distinct advantage. Harvard's incoming class of 2021 is made up of over 29 percent legacy students, reports The Harvard Crimson. Last year's applicants who had Harvard in their blood were three times more likely to get into the school than those without."  (cnbc.com, 9/6/2017)

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