@Ghulgothas hit us with some knowledge then
You can have 6-man squads from the onset,
like here or
here. The only constraint is the finances on hand and the mercs available.
You can break them up into multiple squads of up to six and control them separately, which they do before going into a map
here and are represented by the emblems in the upper left of the screen
here.
They've talked about integrating a per bullet ballistic system that takes level geometry and collision into account since their
first dev diary. And you can see spray deviation and damage only resulting from bullets that make contact
here,
here, and
here.
I understand the inherent suspicion, but all this stuff is obvious from the footage they've been showing off.