Cavalry Rank Questions

Quick question:

Is there something special about cavalry and rank bonuses that I'm missing?

I ask because you often see them in 4x2 which, not being 5 wide, gives up the bonus. As an example, the Lizardmen batallion comes with 8 cold one riders?

It is 5 models per rank for the bonus and not 5 unit strenght, right?

Thanks!

That is correct. In the olden' times ranks were only 4 wide. GW is so cheap that they still sell movement trays that fit four wide even though you have needed 5 for a rank bonus for many years now.

The weird thing is there's a strong rumour of Cavalry only needing to be 4 wide in 8th ed. Good thing I kept all those trays!