I guess it's speculation ...
But without kidding: like I already mentioned, I'm not an expert on Star Wars, but I think I've read somewhere that Lucas confessed that spaghettiwesterns were among the various influences for the movie (along with, yes, Hidden Fortress). But I don't remember where I read it, so it might well have been somebody else who said it, or even only speculation or hearsay.
As far as Star Wars is concerned: I must be one of the few people left on earth who has not yet seen the complete series.
I went to the theatre in '77 or '78 to watch the first movie, wasn't particularly amused by it and never gave the other parts a look.
Recently I hired the original on DVD (and noticed that it had become part IV of the series), thought it was mildly amusing, a lot better than I remembered, also hired the second part and planned to hire the rest of the bunch, but so far I haven't ... Clearly there is no real chemistry between mr. Lucas and me ...
So far the series doesn't feel 'westernish' or 'spaghetti-ish' to me.
If I got you right this time, you don't think Day of Anger had any influence on Lucas. If so, you could maybe elaborate this point of view a little to avoid further misunderstandings.
I certainly didn't want to insult you by suggesting that you misinterpreted a sentence.