nobody because this title is nothing more than a facad. The most probable and logical conclusion as to why al-Albanee was the only one to refer to Shaykh Rabee in this fashion seems that it has to do more with the fact that Rabee was at the head (among all else) to be refuting other people. That would only sound more likely as none has reached the amount of refutations of others as Rabee has done which is why al-Alabanee marks the point tat he is known for criticising and warning. The other statement that is overshadowed in the midst of the mistranslated title as being "Imaam of jarh" is when al-Albanee commented on his rather extreme or harsh overkills in his refutations advising him to take a more milder (objective or moderate) approach. But this qualifiying statment goes unoticed to this day unfortunately.