Anyways, the person's argument is pretty flimsy. They say themselves that Kushina was like Sakura as a child, but then start listing off really general comparisons between Hinata and Kushina that work for several characters, including Sakura. Sakura has also put her life on the line for Naruto, and she also wanted to be recognized for her talents.
And then the cooking thing. *groan* First off, other than filler, there's no evidence as how well Sakura and Hinata cook. Sakura was shown as a poor cook in a filler scene to basically fill out that stereotypical tsundere trait, and Hinata was only shown to make food that Naruto thought was tasty. I mean, the guy's not a culinary expert, he only eats one dish for the most part. But again, it's filler, so unless they can prove that Kishi was involved with that particular episode, it's a pretty flimsy argument.
Basically, this person's really trying to force a comparison. We do it too, I suppose, but if you step back and look at how Kishi drew Kushina in that arc, it really seems blatantly obvious what his intention was. The only exclusive similarities that Kushina and Hinata share are long hair and having been kidnapped by Kumogakure nin interested in their exotic bloodlines. And the first comparison is pretty flimsy, seeing as how Hinata hasn't always had long hair, and it's never been as long as Kushina's. With Sakura, on the other hand, we have tsundere tendencies, initial dislike for the hero, almost identically drawn mannerisms, and probably several other exclusive common traits I'm forgetting.
I don't mean to be rude to the general Naru/Hina fandom, but they really should just avoid bringing up Kushina's last words. That's really an uphill battle for them.
Also, random question, but when was Kushina shown to be a good cook? I must have missed something when I read that arc, because I don't remember Minato saying anything about her cooking.
Naruto and Hinata's reunion could have been romantic, but I think it's own of those things where the scene will be perceived differently based on people's personal shipping preference. Basically though, I took it as Hinata finally moving past hero-worshipping, and finally understanding Naruto somewhat. But, that in itself could be seen as either closure or a sign of good things to come for that pairing. I don't think the latter is likely, but I'll acknowledge it as a possibility.
As for Sakura, she definitely noticed Naruto right away, and their initial interaction was much more intimate than Hinata's (looking each other in the face). However, the scene itself didn't last too long, so it's hard to say if the same understanding took place in their reunion.
Why must you be so smart? But your kinda leaving out that Kushina's act of nature is just like Sakura. Will beat you up in a second if you tick her off, but is deeply a kind-hearted girl. Sakura has had some scenes that show love to Naruto just like Kushina showed love to Naruto. Also, There is a scene where Minato saves Kushina and looks back at Madara with a evil glare, and thats the same exact thing they did with the team 7 reunion when Naruto saved Sakrua from Sasuke, and yes I mean the EXACT THING, face, eyes, mouth, arms, just everything.