3. Ewan McGregor IS Obi-Wan Kenobi
Say what you will about the prequels, but Ewan McGregor is almost universally praised for his portrayal of Obi-Wan. His spot-on interpretation of the wise old Jedi has made the role as much his own as it was that of Sir Alec Guinness. To an entire generation in their teens and twenties, he is their Obi-Wan, and through three movies has more screen time than Guinness did in the originals.
McGregor knows the character more than anyone else, and has played him, off and on, for almost 20 years. There should be zero doubt in anyone’s mind that he could jump right back into the role.