Archetype changes

[Ecliptic12]

Question:

What does the archetype replace when it lists a level that a class doesn't get anything?

For example, Data Jockey (pact worlds) says it replaces class features at 2, 6, 9, and 18.

If my primary class is Envoy, then Data Jockey would replace my improvisations at 2, 6, and 18... but I don't get anything on level 9 (except an increase in skill expertise dice). Would I just not take that dice increase, and set back further increases... so Skill Expertise maxes at 1d8 + 3 instead of 1d8 + 4? or what do I exchange at level 9 for Tactical Analysis (data jockey feature)?

Thanks

[Hiruma Kai]

Page 61. Envoys gains Skill Expertise with a new skill at 1st level and every 4 levels after (i.e. 1,5,9, etc). In addition to sense motive.

Page 127 of the core rulebook.
If you have an Archetype replacement at 9th then:
Envoy doesn't gain Skill Expertise with a new skill.

So the bonus stays the same, just the number of skills it applies to doesn't go up at 9th. So Skill Expertise only applies to 3 skills at 9th (unless you've used Envoy Improvisations to get more).

[Ecliptic12]

perfect... thanks for the help ;)