what if orochimaru wants to make sasuke happy by making minato give his share of kyuubi to sasuke instead of naruto?
Well, Sasuke would have to be adapted to it better than he currently is. The reason Naruto is able to resonate so well with Kurama is because he is an Uzumaki, along with the fact that he has been Kurama's jinchuuriki since his birth.
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Also, there is nothing to say that Sasuke would have Kurama's cooperation. I know he can control the beast externally with his Sharingan, but within his subconscious should be considerably different considering that he could only suppress Kurama's chakra at the beginning of part II and Obito could not go deep into the Bijuu subconscious with his Sharingan.
I think Minato just used up enough of the Kyuubi chakra to lose his cloak.
I don't think he gave Naruto Yin Kurama just yet. It'll probably be more dramatic than this.