You keep saying this like it means anything. The director doesn’t make the posters. Nor does he cut the trailers. Jeff Goldblum is prominently featured in the new Jurassic Park ads but by all accounts he’s going to be in it for about 5 minutes. Parents are the ones who pay to take their kids to these things, it makes sense to cater to them somewhat.
But if you thought you were buying a ticket for How Luke Got His Groove Back, then more fool you. All it proves is my long held suspicion that Star Wars fans take their obsession with a retro children’s film series far too seriously.
...As for “why was he part of the final set peice”...Because it’s the middle film and they were clearing the decks for the 3rd. They killed Han in the first, Luke in this, and presumably intented to kill Leia in 9, because - if you paid any attention - it’s all about the older generation giving way to the next. Something fans of the old trilogy have been aggressively resistant to accepting. Hence the Brexit comparison.