Huh?! You're confusing OBP with OPS.
I'm not. Look at the leaders in OBP in any given year. Nearly every single player near a .400 OBP has 20 HR power. There are a few players like Fowler or Mauer that take so many walks that they overcome their lack of power, but in general it's hard to get that kind of OBP without power, because pitchers aren't going to be afraid to attack hitters that aren't as likely to crush the ball into the stands.