I like the byankugans blood line with th white eys ( but not the seal )

when i saw neji do the 120 dimension attack on the spiders was 1 of the best things that i saw in narto. besides the byankugan is stronger then the normal sharinagn. But now when i have seen itachis sharingan i dont know and neji didnt have a perfect byankugan.

I didnt get everything about the seal that runs through the family in the clan, what was it all about ??
and gaara is just as naruto 1 of the strongest but has no blood line..