attack pools

By TIE wing, in Rules

when forming an another attack pool, when deciding if cover is applied or not, do all attack pools measure from the unit leader?

eg. clone unit with a z-6. the 4 normal clones attacking dooku and the z6 wants to attack a different b1 unit. when measuring from the unit leader, the b1 has heavy cover but from where the z6 is, he has a clear view of the unit. do they gain heavy cover while defending against the z6?

Cover and attack range is always measured from the unit leader.