What Makes A Good Shuffle?

Shuffles are typically seen at concerts with fan favorite songs.  The great thing is that when you've heard a song performed a ton of times it is refreshing to see something different.  The only problem is that you need to consider a number of elements: vocal ability, general voice pitch, dancing strength, and personality/performance.  The producers tend towards one system of creating a shuffle: always and only the favorites.  However there is the occasional silly shuffle.
Favorites:

I've never once seen a good shuffle of this song.  As always they chose favorites, but forget about the actual music.  The original features Kashiwagi Yuki and (now) Takajyo Aki.  Yukirin has a beautiful voice that can be quite deep.  Then it is usually paired (for this song) with a higher-pitched, and weaker singer.  In that case, it works well.  It is duet so you need to consider the combination of the two voices.  Shinoda Mariko would likely work for Akichan's spot, but they never pair her with a deeper/ lower-pitch.  The Oshimas' voices are two high to pair with Mariko's.  The vocals do not work.


Here is a strong case for the senbatsu shuffle.  Want to overshadow the usual performance, then replace all the spots with the top.  Acchan tends to do well in any shuffle I've seen.  A more recent example is of both Acchan's power and the success of the senbatsu shuffle would be Dakishimeraretara during the Yokohama Arena concerts.


Here is neither a bad or good performance.  Blue Rose requires at least one to two of the singers to have lower voices.  Unfortunately, none of the girls fill the quota.  Minami Minegishi is then the only one, that I believe, fits the performance.  The other girls are too sweet or don't pull off the dark, sexy look.  So Miichan shines more than the rest.


I was really tempted to put this in the silly category, but that is only my opinion (I don't think it was on purpose).  This group also does not match the song.  The song is meant for loli/ young/ cute members.  The fact that the serious giant, Mariko, is there is extremely funny to me.

Silly:


I don't think that you are that stupid that you can't understand why these are the silly shuffles.