That sure is one brutal way to use the wood element. I wonder if the First Hokage ever used it that way...

Also, enough with the "Madara was controlling Rin already". The last thing I want to find out is that Obito went through all that and did all that he did just because he was 'tricked'. Madara doesn't strike me as the kind of guy who would go through all that effort to set this up just to manipulate Obito. He seems genuinely disinterested in the on goings of this modern generation of ninja because he believes they do not compare to his own.