If you're a winning poker player you've developed your mind to be patience, mentally tough and have decent self control and very little tilt. Poker helps the mind with thinking, reasoning, patience, discipline, concentration and thinking logically. All traits of being a good business manager. Plus likely other small traits one doesn't typically think about. For example I don't play much live poker but have worked on my live game so I have little to no
tells. I've also worked my live game and mind to look for tells, red a table/room or situation quickly. This has helped me greatly in the business world and everyday life when it comes to reading people and situations.
EDIT: In my opinion pretty much any good and successful business manager/owner if he wanted could become a good winning play if he choose to and took it serious and studied. He likely already has the 3-4 main keys to winning long term(
bankroll management, mental toughness/tilt control and patience). You need all those+ to be successful at business. All he needs is to learn some basic poker+exploits for his player pool and he'd crush micro/low stakes.
Cheers!!!