yea i hear what ur saying, im a itachi fan and hate wen ppl downgrade him aswell. but in terms if they fought an uchia or not im 80% sure they did (no solid proof) but when tobimaru was with danzou and sarutobi they had an uchia on there team which leads me to believe that uchias were out fighting in the war and there is no proof that theye wernt. and you cant bring up the sasuke and KB part, because KB wasnt even trying and could of killed team taka all at once if they wanted to. he admitted he lost on purpose to get out of the village. with that being said KB lasted a tsukiomi and a ameratsu. but like i said those weapons are the only probllem for anyone (not even susanoo).
and kin transformed b4 his bro died
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so that proves that they can transform wen ever they want, they just have to be motivated (in this case, his bro was touched by the rope) and i think the reason naruto had the bones and he dont is because the bones are for the acualal fox transformation, and since he has the chakra and not the spirit he didnt get any bones. or when KB went V@ he got the bones only to do "lariat"..
my point is, i feel the same way about the kin gin bros, ppl sleep on them like they weak when the whole time they were playing and dairu got lucky wen his word changed at the last second. if not for that he would be dead!