Three months ago on TBPN, @markgurman explained why John Ternus is the "only guy" that could become the next CEO of Apple: "All signs are turning towards Ternus." "Ternus is 50. Everyone else on the Apple executive team is late 50s through their mid 60s. Turning 66 this year, in the case of Tim Cook. You're Apple's board, you like continuity, you like an insider, you like people who know what they're doing, and who have been there for a while, they know where the bodies are buried." "At 50,…