SSHE question

[snoopdawg]

Pages 237-238 talks about raising BB with AJs against 5 callers. It says you should raise. But on page 238, it says that by checking you are passing up a profitable oppurtunity and "Keeping the pot small helps you increase your postflop expectation, but at the cost of a smaller preflop expectation."
I think raising would be the correct play, and they say it is, but those 2 sentences say (or at least what I got out of it) that you'll get a bigger postflop edge by checking than you would get PF by raising. What did they really mean here?

[Rudbaeck]

Both things are true at once. If you check your postflop equity is likely higher. But raising preflop is so profitable that it offsets the percentage lost postflop.

[snoopdawg]

That's what I thought, but the way they wrote it made it confusing. "We're poker players, not writers" or something like that.