That is just a subset of the stats. Go here for the longer list, and do the math:
http://www.fourfourtwo.com/statszone/23-2013/matches/707777/summary#tabs-wrapper-anchor
If you add up all the passes to/from Alba/Iniesta/Pedro and those to/from Alves/Xavi/Sanchez, you get the bigger picture:
Right side (total 93, if you include Pique's to Alves):
Hernández to Alves da ... 26
Alves da ... to Hernández 26
Alves da ... to Fábregas 16
Fábregas to Alves da ... 15
Piqué to Alves da ... 10
Left Side (total 125):
Alba to Busquets 20
Alba to Fábregas 18
Alba to Iniesta 14
Alba to Rodrígue... 14
Busquets to Alba 14
Iniesta to Alba 12
Fábregas to Alba 11
Rodrígue... to Alba 11
Alba to Hernández 11
N/A:
Busquets to Hernández 14
Hernández to Busquets 13
Hernández to Fábregas 12
Piqué to Hernández 10
Over half the passes (52) on the right side are simply lateral passes between Xavi and Alves. Also note that passes to/from Sanchez don't even make the list. The ball moved to the right, but rarely advanced on that side, and simply cycled back to Xavi.
More informative are the heat maps and pass maps at WhoScored or Squawka. While the right side was not ignored, it's clear there was more action and attempt to penetrate on the left. Here is the attacking side of the pitch in the 1st half (before Iniesta's exit):