Nah, Proof wasn't charismatic enough to even be close to Tupac. Why do you think he was one of the least familiar of D-12? He had no personality, or at least not one great enough to capture a large audience. His rapping style didn't help, either, some of his rhymes were tight, others not so much at all. A sub-par rapper at best, but still, gotta show love for D-12.