The lightsaber thing all can retrospectively be seen as a bit of 'need to know' pricktease.

Yes he has the same sword as one the Jedi who helped save them.

Yes Luke could be proud of him from their point of view.

Yes one of them returned wearing armour after killing the other two.

Yes one of them had a funny hair do.

We are led to believe via the power of retcon that funny hairdo man is meant to be Luke's dad but he isn't (well not now, but if Vader wasn't meant to be Anakin he would have to be bad hair-do guy).