I just meant that people might be so energized from Cage that they would find an extremely progressive set to be... "boring"
and then walk out during their set. I can't imagine two bands more polarized than Cage and Mindflow, neither possessing the characteristics of the other. That 180 degree transition might put some people off to Mindflow. No one wants to see that happen, so hopefully the prog fans will come in droves for Mindflow's set!
Cage is the clear option for the opener, there's no questioning that. It'll be intense! Mindflow are intense too, just in a different way that prog is. Actually, I think their "slowest" song is by far the most intense and emotional, but then again, I'm a prog fan already. heh
As for DSO, I have a feeling it will be packed due to curiosity, then it will either thin out dramatically or they will somehow captivate the crowd and surprise us all.