It's still a bit suspicious, he said that he doesn't even know what type of leak it is, he suspects it's a picture but he's not sure.
I mean, he has never seen any picture; in that case, he knows of the leak only by words, right?
If he knows it by words, the person who told him about the leak would have either:
-said the name of the character
or
-say no names.
In case he heard of the name of the character, he shouldn't have any doubt about it, unless the source is not reliable, and in that case you can't exclude Ken because it can still be.
In case they never told him the name, it can still be Ken, unless they said him "a leak is real but is not the Ken one", which is extremely unlikely.
So this situation is a bit strange...
Maybe he knows the name but simply doesn't want to tell it to avoid getting in trouble, or it's all fake, IMO.