Uh, no. With that kind of logic there wouldn't be any colour spreads in One Piece to begin with.
The thing is, it's somewhat of a habit in Jump to include a colour page or two when putting in a colour spread. Oda hasn't done anything like that since, what… That little skit before the Davy Back Fight?
Though, I'd write it up to him being too busy or some other.
Oh, and Ace, your example is in black and white because, while the colour spreads are in full colour in the magazine, they're rendered black and white for the book releases. Which sucks, because it usually looks like crap. Hence my manly desire for a third Color Walk.