Order Pressing Days on HP Mass

Thib, why do you perform 2 upper body press days in a row (same for lower body)?

What would happen when you switch days so that you become day 1: upper body press, day 2: lower body press, day 4: upper body press, day 5: lower body press?

I also have an additional question…Will the lateral part of the deltoids grow well, because it seems they don’t get a lot to do.