Mithrandir said:

So ressuming, what do you think of this? If you put something like "your father was a great warrior kid, If he was here he'd make somethings a lot easier to us" before the attack on the DS would be counterproductive?, or even later, in ESB??

Nice idea. If I remember correctly, there was some dialogue cut from the Biggs scene added back in the SE where another pilot says that he knew Luke's father and he was a good pilot. I seem to recall watching it somewhere a long time ago although this could be a false memory, like the grappling hook.