Right now, Naruto uses shadow clones at will. His most powerful usage (besides mass shadow clone) has been leaving sage clones and using 2 shadow clones to form FRS.
Naruto making FRS {assuming sage mode}:
Naruto: Wind chakra
Clone 1: Shapes chakra
clone 2: Adds rotational speed
clone 3: Adds? - 2nd element?, Kyuubi chakra?
I am not saying that a 3rd clone here would constitute a Kekkei Genkei. I'm assuming that his second element would be weaker than his natural elemental chakra like everyone else. I believe he's already made a Kyuubi Rasengan when fighting Sasuke pre-time-skip, so I think it's possible.
All I'm doing is leaving the door open for discussion if anyone wants to. Also, if I'm wrong here, let me know, and I'll edit it.
Naruto making FRS {assuming sage mode}:
Naruto: Wind chakra
Clone 1: Shapes chakra
clone 2: Adds rotational speed
clone 3: Adds? - 2nd element?, Kyuubi chakra?
I am not saying that a 3rd clone here would constitute a Kekkei Genkei. I'm assuming that his second element would be weaker than his natural elemental chakra like everyone else. I believe he's already made a Kyuubi Rasengan when fighting Sasuke pre-time-skip, so I think it's possible.
All I'm doing is leaving the door open for discussion if anyone wants to. Also, if I'm wrong here, let me know, and I'll edit it.