During a four player battle royale game, this Unit is set as active by its effect when it destroys Player A's Shield. Afterwards, can it attack Player B or Player C, who it has not attacked yet?

Can I exile the appropriate cards and activate this 【Deploy・Development 2】 effect even if there are no enemy Units with 4 or less HP in play?

Can I exile the appropriate cards and activate this 【When Linked・Development 2】 effect even if there are no Lv.4 or lower Command cards in my trash?

If I activate this effect during a team battle, do I draw two cards then discard two cards since there are two enemy players?

If I activate this effect during a battle royale game, do I draw three cards then discard three cards if there are still three enemy players?

Are the conditions for this effect fulfilled if there are two or more rested Units in play, regardless if they are friendly or enemy?

If I pair this Pilot with a Unit that is Lv.4 and its 【When Linked】 effect activates, does that mean the target chosen with the effect is a Unit that is Lv.4 or lower?

Can this effect choose any Unit, regardless if it is friendly or enemy?