#5. Shinsuke Nakamura
Shinsuke Nakamura is another superstar who hasn't changed brands since his debut. He had a run in NXT that lasted exactly a year and saw him become the first-ever 2-time NXT Champion. Big things were expected of him and he had a decent year, to begin with, challenging for the WWE title a couple of times and then winning the Royal Rumble in 2018 to set up a dream match with AJ Styles.
While that match underwhelmed, it was a trigger for his heel turn and Nakamura has enjoyed plenty of Championship success since then, becoming the United States Champion twice and the Intercontinental Champion once.
He's at the point of his career where he doesn't care too much where he is creatively. He has a big-money contract with WWE and gets compensated well every year. Dave Meltzer of the Wrestling Observer Newsletter even said that he's "checked out", happy to collect his paycheque and surf in Florida.
We certainly don't blame him for being content and if that is the case, SmackDown should be a permanent home for him until his retirement.