Well, you're right that everyone is entitled to their opinion. And it's possible you're right about Tony once being Italian, but in my opinion, not very probable. The corresponding character in the 1949 version of this was most likely Irish and not Italian, since the Jets were an Irish gang. Whether there was ever an Italian Tony, in the 1955 redraft, I don't know. The Jets seem like an ethnic mishmash to me. I think the name Tony is much more accessible to all American audiences than would Zbigniew be. Can't quite see "Zbigniew" fitting into the music either. "Zbiggy, Zbiggy, Zbiggy" rather than "Tony, Tony, Tony?" I don't think so. For what it's worth, neither Anton nor Zbigniew make it into the top 100 of Polish male first names. http://www.studentsoftheworld.info/penpals/stats.php3?Pays=POL
In the original 1949 version, the Jewish gang, the Emeralds, would have corresponded to the Sharks, not the Jets. If anything, Jews would be expected to analogize their immigrant experience to the Puerto Ricans, not to the Jets. So making one of the Jets Polish doesn't seem too helpful.
Also, although you say that Tony looks more Italian than Polish, many have complained that Natalie Wood doesn't appear very Hispanic, either. I don't believe that the actor, Richard Beymer, is either Italian or Polish. As for the singing, Tony was sung by Jimmy Bryant from Alabama. I'd hypothesize that Richard Beymer was cast because he looked more like the typical teen heartthrob of the day (e.g., Elvis, Frankie Avalon, Fabian, etc.) than because of any particular ethnicity.
Moreover, you're overlooking that prior to the movie, there was the stage musical. On stage, Tony was played by Larry Kert, who doesn't at all appear Italian. So you'd really be suggesting that they were thinking of changing Tony to Italian in between the stage and the screen, which seems even more unlikely to me.
You say that definitive documentary evidence is needed. Since you seem interested, how about doing some? There have been several books written on the subject. I read "West Side Story: Cultural Perspectives on an American Musical" by Elizabeth A. Wells, which had some interesting background. Looking at Amazon, there appear to be three or four others. I found the book I read in the local library. And if you're really interested in it, I think that each of the four creators, Laurents, Bernstein, Robbins and Sondheim have left plenty of archival material. So, please, go do some digging. I think those of us who regularly post on this board would be interested to read about what you find.
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