Obi Wan witnessed the Separtist high council boarding their ship preparing to depart to Mustafar under Grievous orders, as he was spying upon them on Utapau with Boga..if he had been a few minutes early, he would have heard they were going to Mustafar. Is this a flaw on Palpatine's part or Grievous? I mean why did he wait so long to haul Nute and the gang away form Utapau when he should have done this in the begening of the movie when Sidious orders him to, why didin't do it then? My only conclusion is that these two events (Obi Wan spying and Grievous briefing Separtist) Happen at different points in time. I just watched ROTS again this afternoon and many questions dawned upon me. This is one of them. Anyone wanna try to answer this one? EDIT: Oh! And why did'nt Obi Wan attempt to attack or arrest them (Gunray, etc) as well as Grievous?