You people really can not read between the lines, I will show you why obito said all those things which only madara would no and say:
What kakashi said in the 2nd panel is why obito said so much things that only madara would say, he was begin questioned about being madara. Normally you would be able to catch someone out who is lying about their identity but obito seemed to know so much which only madara would know, this is why we all thought obito was madara. Little did we know Madara was obito's master and was taught and trained by him.
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Also when obito was lying saying his brother (Izuna) scarified himself for him he clenched his arm something that only madara would do to make sasuke think he felt pain for his brothers death. Once again making us think he is madara obito went from a loser to a mastermind and we are just getting the back story to how that happened.
Damn don't you get the chills in the 2nd panel thinking how close kakashi was to his once best friend obito and not even realising it