I respectfully disagree. AUHWUHA
Looking at the stats alone, broky is doing only better than rain (just a little better), but rain is a more complete player and has a lot more experience than broky. He is far more important to the team than broky is, that's why I believe broky should leave, so they could bring a real IGL.
They could have room for broky in the team if they didn't bought Coldzera. Than he would play alongside rain, olof, niko and some IGL.