ETA: Re GB vs any other:
-you also need a strong lobbying body to even have chances to be nominated. Ther producers of GB have that clout because - like it or not- Zoya has big American appreciation since ZNMD era. There aren't that many that have bigger US clout/appreciation: maybe Kayshap (but he has more in France/Europe) and of course the biggies like SLB and Hirani(lost a lot since allegations) and such.. but from Indie(meaning Indie as type of movie, not movie from India) market.. nah.. only Zoya has the reach
You need some actors that have SOME kind of recognition OUTSIDE India for their work (again, RS and AB have that, others aren't well known and it matters).. so there's SOME kind of 'fanbase' for the movie- a natural movement of 'pro' voting to aid the 'behind the scenes' lobbying.
It's like voting: you need the charismatic leaders (lead actors), the behind the scenes lobbyists (producers with clout) but you also need support from general population..a natural love for the 'leads'.. or you don't get a big enough majority (your movie doesn't get nominated).
I might like or not GB but I can see that by choosing GB India is trying to get the nomination at least- and I don;t think you've even had a nomination since 2000.
SO I'd say they are smart by choosing GB.
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