Or “the rise of the series that change OPs really often and artists fond of caps lock”.
10. Gurren Lagann, “Sorairo Days” by Nakagawa Shouko
I love the way the third opening actually uses the later part of the song.
Incidentally, it just edged out the opening for New Getter Robo. Even on this list Gurren Lagann overshadows what it homages.