Clarification on objective placement

By TchnoSurfer, in Tannhauser

The rules for placing the objectives are fairly confusing to me.

Where it reads

1. Which objective tokens should be chosen?

.....If there are more than 4 objective tokens of a particular objective category, select only four and return the rest to the box. Next, sort your remaining objective tokens into main objectives and secondary objectives. Finally divide them into sub-groups base on their objective categories.

Seeing that both teams have to have objectives in story mode and there are only a few objective markers on the board why would I have enough markers to place that I can make sub-groups. Also the rules imply that when they are placed it will reveal the 2 skills necessary to complete the task. It is not possible to be able to tell where the markers go without actually looking at the token's face up side.

I guess what I'm getting at is would it be easy to simply say choose 3 unique objective markers and 1 secondary and then roll for deployment?