Why does everyone assume Trump will let Pence govern for him? He seems the type to want to control everything. And if he does want an advisor, it doesn't need to be Pence.
If you know anything about Trump, you'd know he is not equipped to handle the reality of being President. It's not Hollywood with nothing but big speeches and parades, the President's job is stressful, tedious, hard and long. It's working all day every day (and sometimes the night too) with repetitive meetings, conferences, reports, travel, signings, briefings, etc.
Trump couldn't even sit still for a single 90 minute debate with Clinton, three times. Every single speech or answer he gives is rambling nonsense. He couldn't even sit for debate prep. Can you imagine him spending hours every day in meetings and briefings, overseeing all aspects of running the country? He has zero experience in politics, only in business, it's not at all the same thing.
There's a reason presidents age so much in office, it's a hard and stressful job that's 24/7. He'll hate everything about the job other than the superficial ego boosters like sitting at the oval office desk or travelling in a motorcade.