In CoC, Ray Franz mentioned that they moved from a unanimous vote to a two-thirds majority of all GB members (even if all were not present). It's possible that they have changed it back to unanimous. But if you did that and then literally removed a dissenter, it defeats the purpose.
More likely, they feared that Morris would become a loose cannon who would undermine what are already a difficult set of changes to implement, which could have led to a schism. And that would have brought the whole mess down quickly. Better to put him in a position where he could wash his hands of the matter but also would not want to speak out, lest he find himself homeless.