Alright, I concur. I corrected the heading to "strongest".
Anyways the interview is extremely likely a fake. This rumour, which suddenly became popular around May 2008, was claimed to have been published in March 2008 Jump Festa, while a lot more claim it was March 2008 Shounen Jump.
Raw scans of all other Kishi's interviews are readily available except for this one. In fact only one translation of it, which doesn't even reference an authentic original Japanese text, exists. This simply means there is no original Japanese text out there, else there will be varying translations of it.
Finally the 3rd databook, which was released 6 months after the alleged date of this interview, made no mention of such fact.
In fact, this is the post (April 02, 2008) that popularized this rumour:
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And this is now currently the post (July 16, 2009) that gets referenced the most for this interview:
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Above all, I'm proud to finally proclaim that I've found the original source of this mess. It was faked and published by Jonas from narutofan.com forum. The web page has been taken down, but one of the earliest repost (March 29, 2008) of it in another forum (less than two weeks after the original post with reference to the original post) is here:
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read the whole thread and you will realize just how fake the original source is.