Big Boi always was cold on the mic. ALWAYS. There is no Dre as we know him, without Big. They were necessary to each other. Honestly, Big was the reason some of their core fans kept listening to Outkast when Dre started to really get existential wit his rhymes (nyggas flipped out during the white wig, shoulder pads stage). Their identity started changing from southernplayalistic to atliens, but it was ok cause there was a balance still. They are a real group, where you feed off the other, collaborate on ideas and compete to make a song the best it can be. It's not like Dre just go in the booth and drop a 16, followed by Big, tell the engineer run that and wait for a magazine or blog say who was better.
If ya'll havent noticed yet, Dre is very, very self conscious about how his music is received (I really think this is why he doesn't want to do a legitimate solo). You know what gave him the confidence to be "that" Dre everybody loves? Big being the grounded one who, to this day, still represents the core of what Outkast is--edutainment music filled with sharp lyricism and boundless wit over banging melodic beats. Dre drops outstanding guest verses, but he is SPECIAL with Big. Is Dre better than Big? I can't say. I don't really know who Dre is without Big, but Big has done more than held his own.
Can't wait to hit up Centennial Park Sunday and watch them kill it.