Let’s be real, Lucas also directed ROTJ.
Are you on crack?
It’s commonly believed Lucas backseat directed much of the film, due to Richard Marquand’s shortcomings handling such a large cpmplex FX laden production. IIRC, Lucas directing some second unit sequences is documented. He was definitely on the set much more than he was on Empire.
He executively produced a number of films which I assume he had a lot of input into but he is not credited as the director for them either