It is Larians decisions. I was merely trying to think of a somewhat plausible explanation. Something that is a bit better than "Half of your group went missing for some reason. Now continue, nothing to see here"
Lae'zel would grow impatient at some time if she is not part of the group often. If Larian absolutely wants to fix the group at 4 after act1, there should be some party interaction to explain it.
Yeah like there was in dos2. Wait....