They can certainly do that if they have power. It is just harder to do it as a speed player when you cannot do much damage with a first pitch fastball. Power hitters gain that OBP by being pitched around.
I would not put much stock in a Crawford HR at elevation in an tournament with uncertain quality opposition. He does not need to be a 30 HR guy, but I do think he may need to be a 15 HR guy that can also bunt enough to keep his average in the 270-300 range. That is a really good player assuming the CF defense grades out well. We'll need to see more of that to judge whether he is closer to Rojas or Marsh defensively or (most likely) somewhere in between.