As for nick and aj (and the comments DR RonP made). I personally don't remember seeing them featured in the audition shows. Maybe they were shown in their original auditions. But their stories were not memorable i really don't remember any focus on them. Also they may have been shown during groups week. But if they were they were not the focus of the group.
Your not remembering them does not equate to their not being featured "as substantially" as any of the others. I suspect you remembered who you liked.
Also, this not remembering them does not validate the theory you said was proved by last night's evictions.. Half the evictees last night were featured "as much as" anyone else I can recall.
And you are correct about Sanjaya....he wasn't featured during Hollywood week at all...except at the end when he had to let his sister know he made it to finals. Again...NO EXPOSURE of any significance for Sanjaya except that he is memorable for walking in with his sister, auditioning for the fun of it (SHE was the one they went to auditions for), and for having Simon tell him he was better than she was.
I didn't think much of either of them, but I remember them. And I remember more attention being given to Nick and A.J., as well. And to the guy who left last week...Paul Kim.
As for folks who were the focus of their groups, many of those folks were rejected.
Of those remaining in the competition after last night, Lakisha, Melinda, Gina, Stepanie, Jordin, Sundance, Blake, both Chris's, Jared and Phil are equally prominent in my memories from the auditions/Hollyood segments. I remember at least the auditions of most of them, and significantly more information on several who have been voted out.
That is all.