in a simple way yes it would be. the original films is really the journey of anakin from young boy to his death, and the journey it takes whilst the galaxy changes around him. So Luke was a good character in that sense because he didnt follow his dads footsteps as it were so the ending of jedi was significant in that way.
It might not be true about luke, i mean there is nothing confirmed and it is all theories until the film comes out. It would explain his absense from the trailer but then (despite not being a trek fan) i loved the cameo from spock in it, so that is probably the better option