Originally Posted by jeanericuser
I think I found where you are getting that info from. You are reading wikipedia stuff aren't you? Here is what kabuto thinks when you compare the curse seal to sage mode. http://www.mangahit.com/naruto/579/11
Juugo was not trained at there. His body actually has a some what natural ability to gather it but the problem is unlike real sages which transform properly into real sages, Juugo and his clan transform into abominations that can't use the real power of sage mode. They can only optimize their existing body unlike real sages which can upgrade. In essense the best way to compare this is Dragonball Z super saiyan 2. When trunks and goku first tried to go super saiyan 2 for the first time they did it poorly which resulted in them transforming into an oversized brute that was just a pumped up version of super saiyan. When gohan on the other hand transformed into super saiyan 2 he did it properly with a true transformation. Juugo may be able to gather sage energy but compared to the other he is not in any way a real sage. If sasuke were to try and use juugo's cells he would just have the same effect. You need the real training at the real place otherwise the version of sage mode you end up with is just a piss poor copy.
No I have not used any Wiki Lol...
It's the fact that Juugo and his clan's ability comes form Ryuchidou which teaches ONLY senjutsu and even Juugo confimred that his Curse seal powers are actually Sennin/sage powers... Allowing him and hsi copies to transform into sennin/sage's through the gaining of nature energy.
However, the inability to perfectly balance the nature energy causes them to go bonkers and can account for their dragon like forms...
However, just because they are imperfect sage's like Jman was, does not mean they are not sage's...
As long as they can produce sage chakra and not become a statue, then they are sage's... Just imperfect ones, but sage's None the less.