Not really true, that's nevere been stated to be the case. Chakra control and the ability to use ninjutsu and genjutsu are two seperate things.It was said lee has no talent what so ever, Which includes chakra control and if you can't control chakra you can't use any form Ninjutsu or Genjutsu.
No it's not, Naruto's main reason is his inability to concentrate/focus so he splits the work between two to make up for his inability to concentrate/focus.Forming a Rasengan is all about controlling chakra, It requires two levels of chakra control to form, Emitting chakra while also using shape manipulation. Both are chakra control oriented skills, Naruto cannot do these both simultaneously so he used a clone to split the jobs. His main body emits the chakra while his clones handles the shape manipulation.
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This is a fault his his ability to control his chakra. Nothing else.
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That's why when he learns SM which requires and trains the ability to focus/concentrate he's able to perform 1 handed Rasengan.
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