Preserving the core while stimulating progress is axiomatic to a thriving business.  So innovation must take place at various levels around the core business.  Each layer around the core has very different innovation needs in terms of skills, paradigms and processes.  What works at one layer will likely fail at another layer.  Also, extensions immediately around the core have a higher probability of success, but generally a smaller return that more risky big bets farther from the core.