I've never heard this rapper before.. but as you can see, his album is full of profanity, sexual content, and the usual "gangsta" content..
So, for Da TRUTH to collab with this dude would affect him?.. I believe so, the negative way..
Now, to "condemn" CMR or TRUTH for not collaborating, it'd be like the case where they are invited to a strip club to "talk about the Lord"... from my humble point of view.. and like awally said, if he wanted advice, he should've just ask for that..
now, we do not know the whole scenario.. that's just Tech N9ne's part of the story..