What? Konan could simply go under the water :| Not to mention i doubt its a move he would use early on, as it clearly takes a vast amount of chakra for an elemental technique,
Fu and Torune, whatever you say its not quicker then Kamui ......Which btw keeps them alive as well
:| Why would he want to Kill Kabuto, a potential ally, again he's not going to use this straight off the bat,
Why you say he's going to create this technique when he was already trying to learn how to use the 6 paths technique is rather crazy
Konan was in her paper form, she'd have no mobility if she went underwater (Taking the awkward premise aside.).
And really, for someone of Obito's calibre, no it doesn't. Again, speculation; lets not forget Obito did this feat after surpressing six Bijuu all in one sitting.
He tried to kill Kabuto, it's a fact.
This is your argument falling apart now, you're ignoring all I've stated prior.
I'll address this none-the-less; the fact is that Obito's fight against Konan was far too risky, his ultimate defence, Kamui, was taken as a joke by Konan. She completely defeated the technique and thé only thing that saved him was Izanagi.
Such a thing hasn't happened since Obito fought Minato - where minato's victory was more misdirection, than actually defeating Kamui.
Obito relied on Kamui for attack and defence, the fact that someone got around it implies somewhere down the line someone else could do the same, this being a possible reason why he adopted Madara's Gunabai (For defemce.) and improved on his own base Skills (Ninjutsu, Taijutsu.) for offence, as Kamui simply wouldn't cut it.
You can also notice he did it at a point where he had no other means of fighting (No Jinchuriki.)
Mostly speculation, mind; but you've yet to actually prove he had it prior to the Rinnegan.
Going through scenarios, I see no way for tobirama to get past obito's katon. U_U
He had a mask on. XD
Do you wish for me to formulate a collagè of Shinobi performing Ninjutsu through their masks?
At any rate; couldn't Obito just Kamui that part of his mask away?