Greg had to take over for short periods in the past and did an excellent job. You could argue that he took over when most of the stuff was already set in stone

Greg had to take over for short periods in the past and did an excellent job. You could argue that he took over when most of the stuff was already set in stone but still, he did a good job. That said, I'm not sure if he can or would be even willing to do that in the long run.