What do you mean there's no disputing that Naruto has shitty chakra control? The post you quoted did just that. And no, I don't think Naruto's Rasengan has more compressed chakra because of the amount of chakra he has. Rather, I think it's because of the amount of chakra he can put out in burst. It's been both stated and demonstrated that this was a talent of his. And the feel of Naruto's character is that his potential for burst chakra output is more than anyone elses. The fourth might have had more, but on feel, I doubt it. Also, how do you know Sasuke's Chidori isn't stronger than Kakashi's? You're making the same assumption about Sasuke/Kakashi's chidori that I am with Naruto/Jiraiya/Minato's rasengan, without even a hint of an explanation.

What Naruto dodged by using clones to make the rasengan, is EXCEPTIONAL chakra control, not good chakra control. It seems like you're not remembering the big deal that was made about the technique's difficulty level. It takes EXCEPTIONAL power and EXCEPTIONAL control to use the Rasengan. You can't just be GOOD at those things to pull it off. So just because he couldn't do the rasengan with one hand, doesn't mean he's particularly lacking in the chakra control as compared to other ninja. This is the reason I said the second thing you quoted. So even if they were taught, if they lack exceptional control (which again, decent does not equal exceptional) or exceptional power, they can't do the rasengan, even if it was shown to them. This includes Kakashi. His rasengan is useless in battle. Lack of power.