Very relax le.
If you are boss pet. Your promotion is every few years.

Then just show some presence. Hold some meeting.
Keep quiet abit. Talk abit.

Let other do all the work.
Update your boss about how good you are managing the progress.

Then move on another project.
Then that project got problem. Just blame the E5.
While you get promoted.

So good what. Then the boss change every year. Reorg every year.
No need to suck up to new boss.

Just find an old boss and let him take care of you.
Easy life. Retire together.