The following is my opinion:
The words on the patrol board / rulebook are a summary of game effects that apply (on other player’s turns) to your patrollers. The “real” rules are:
Your Squad Leader is considered to be patrolling “in front of” your other patrollers
At the start of each opponent’s turn, your Squad Leader gains 1 armor, which it loses at the end of the turn, or when it leaves the Squad Leader slot
If a unit or hero enters the Squad Leader slot on an opponent’s turn, it gains 1 armor, which it loses at the end of the turn, or when it leaves the Squad Leader slot
A unit in Elite gains +1 ATK. This is applied in the same layer as any other ATK/HP modifiers, because there is no reason for it not to
If a unit/hero in scavenger/technician slot dies, you (or the unit/hero’s owner if it was loaned) gains 1 gold / draws 1 card.
To target a unit/hero in the Lookout slot, opponents must pay 1 more gold (similar to the resist ability)