A personality like Steve Jobs's would never tolerate having another Steve Jobs around, so this is what I always assumed. Steve was always laser focused on a small number of elements to create buzz (one button, really thin, it's a cube...) and a small number of products (goodbye old model, here is new model, it's not compatible).
Tim Cook has been adding blur from the first moment.
I also see an odd parallel in another corporate transition... even though it's the same leadership, is the new re/code more than a shadow of the old All Things D?