Let's assume this is true... The CTO wants someone that will mentor but is unwilling to mentor his team. :-). Seriously, set expectations for your team and see

Let's assume this is true... The CTO wants someone that will mentor but is unwilling to mentor his team. :-). Seriously, set expectations for your team and see if they rise to it. Folks don't read minds. CTO is probably screaming about how slow the release is and developer is cranking out feature after feature and now is flipping it around that developer is not talking to the business. If the developer was spending time, talking to the business and mentoring and doing little coding, perhaps CTO will claim that developer rarely ships and is not qualified. Frankly, folks that care about promoting from within do so and does that don't, will always look for outside talent.