There's a lot of problems with this argument, the MStation thing had nothing to do with how many members were on stage. The cameraman was using a gimbal to stabilize the camera and it stopped working at the end of the performance, he didn't bump into any of the members. I don't think it's that often that we see cameramen moving between members like in that performance anyway. If you want to complain about the size of the stage then you'd be better off criticizing the moving fences which took up space around the edge. Or they could expand the senbatsu to include all 25 active members (not including Aoi and Neru) which would accommodate every 2nd gen member without leaving out a handful of 1st gens. 4 extra members in senbatsu really isn't that much of a stretch.