u can argue dre, but I don't think he is half the rapper kanye is
Black Milk outta detroit has his own kinda production/rapping style, but it's got more of that dusty underground feel
I heard Krit entirely produced Return of 4eva by himself. That project is a classic to me.
Even Blu self produced all of herfavouritecolour, as well as a couple other projects (Open, a project with Sene)
There is Childish Gambino
In the end Kanye is the most iconic producer/rapper. Back in 04' I didn't even know he was a producer when I listened to College Dropout the first time. There really is none of that stigma with him like oh he's just a producer trying to rap. He can more than hold his own on the mic.
Like Exile, For example, last year produced a project that he rapped over by himself. He doesn't sound like a polished rapper at all. Some dope tracks on there, more in part to his sick chopping, but for the most part it just sounds like he's ****ing around.
Cole still on the come up. He is movin real slow tho. Kanye already Dropped Out, Registered Late, and Graduated in the time it took Cole to tell his Sideline Story.