Grand Justice declares ROC constitution rapable

What is 協同意見書? In his quote, 大法官黃茂榮 clearly stated that it was wrong to 換法官. Then why did he 支持合憲解釋的多數意見?

大法官黃茂榮則在協同意見書中說，「既然法院院長可以決定審案法官，為何當事人不能自選法官？」