Personally I feel that the 5 years of reintroducing 14nm instead of getting 10nm out the door was what ate up any lead that Intel had over its competitors.

And don't forget that rumors has it that Apple reported more bugs with Intel Skylake than the QA team at Intel had managed to report. Never a good thing when one of your biggest customers finds more bugs in your product than your own engineers have managed to find.

I wouldn't really blame all this on a single person though.