Rasengan mystery

[xcoyote]

this happened

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[Gerkak]

This.^

His mask is probably a strong metal, the fact that it broke the mask is still impressive.

You're comparing Naruto's rasengan that broke probably the strongest compound of metal on earth (just a guess), to Kakashi's raikiri that pierced flesh... great comparison.

Naruto hit obito with a rasengan earlier on his arm yet it didn't blow his arm off. And the rasengan was even bigger than normal. I call bullshit

 

[Voidstep]

But that was a boss move, after that rasengan he was able to tag him out and the seals never goes again, i didn't understand why minato didn't kill him when he was leaving with his hax (kamui) it would have the job done. He should have the 3rd hokage deal with it, he has the Dead Demon Consuming Seal

yeah, it was a bit weird why he didn't just finished the job right there. he could do that or just stab him or something right after the contract seal, instead of wasting time talking to him, telling him the fox is no longer yours, etc.
plot, the villain couldnt die yet xD

 

[DeadManWonderLand]

Sorry but this dosen't answer my question.

It does because,each event you pointed out was in different periods of the manga where growth(Naruto getting stronger) and circumstantial situations came into play(When sasuke and naruto are heightened from kurama cloak or curse mark level 2 forms)

 

[DeadManWonderLand]

The mask protected his face from the full damage... Rasengan and Chidori have to different types of effect on an opponent... Rasengan smashes/crush while Chidori pierce/slice opponents...

This ^
hvfiyuweviu

 

[darkmanure]

Those characters got plot shield. Just like one moment BM Naruto is super fast then the next he's normal speed. It's all plot.