Pic priority in rolex brochures

[sub2004]

Hi Friends

I was flipping through the nice big rolex brochure. Maybe i hadnt picked up on this before, but it seems to go in sequence of "base" models to "high end" models. For example, it starts with airking, date, datejust, day date, and even within each subgroup, its ss, tt, full gold, diamond etc.

This got me quite interested in the positions.

Can anyone explain why the sea-dweller is BEFORE the submariner in steel in the brochure?

Here is a pic of the current state of my collection.