Well maybe because he is content and happy staying just right where he is and doing what he is for all those years. I mean he don't have to promote himself if he don't want to. It depends on what you want and what you will be happy with at the end of the day.
Reaching the top may not always be needed for people to be happy and content. Its not always about getting promoted and earning as much money as you can. Its about self satisfaction and self content. People have different expectations some have high some have low.
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