I see another error in the poll. Zazaki actually came from Hewrami when Hewrami speakers began migrating west. But then again Sorani came from Kurmanci so I guess we could divide and combine these groups all day.
About Sineyi Sorani...I speak Sineyi and I actually believe Sineyi Sorani has more Arabic in it. While I was in Kurdistan, many of the Hewleri people used a lot of Arabic in their Sorani. I find the Silemani Sorani more pure than all of them if we compare these three. It uses much less Arabic than Sineyi does. The only strange thing is how a Turkish word sneaks into their Sorani once in a while.
It's interesting because I don't think these present day borders are the biggest factor in the influence of our dialects. I think it has a lot more to do with our past.
And as far as grammar, you can say the grammar of all the dialects differ but I think the most similar are Sorani and Kurmanci. I think Kurmanci just has a few extra rules like how to make a sentence negative, and the plurality of nouns ending in a vowel is slightly different than it is in Sorani.
And Hewrami has a lot of grammar similarities with Gorani.












