Drop count for turn priority/Units in reserve

[Gwendar]

I just wanted some clarification on reserve units (like gutter runners) counting/not counting towards an army's drop count on setup.

Example: I have an Arch Warlock, a unit of Jezzails, and then a grinderfist Stormfiend unit and Gutter Runner unit "in reserve" as per their rules to enter later during movement. Is my army a 2 drop, or a 4 drop? 

Also, another question in relation to this: Lets say I go first so I put down my warlock, then he places his unit. Do I then need to say "My next unit is Gutter Runners, but they will wait in reserve" in order to have him place another unit down, or do I just need to list all of my units in reserve at the start of setup?

[rokapoke]

Placing a unit in reserves (generally) counts as a drop. When it’s your turn to place a unit, tell your opponent that you’re putting your Gutter Runners in reserve. 

[EMMachine]

I think there are only 2 instances where you get less drops.

• The Units are part of a Battalion.
• If 1 unit can take other units into reserve (1 Warp Grinder Team + another Team that arrived through "Tunnel Skulkers" should count as one drop)