I have a couple of questions abaout the timing of "When this unit attack":

Question 1:
1- I attack with "Ambitious Spirit Revenger, Cormac" in Legion.
2-I activate the AUTO effects, I read that you can activate in any order if they activate at the same time, so I choose to activate first the second AUTO, giving her 3k of power, then I activate the 1st AUTO, retire the boost unit behind her.
My doubt is that if the boost unit is retired, then Cormac do not get the boost, right??

Question 2:
1-I attack with "Metalborg Sin Buster" in Legion, and rest it.
2-I choose boost with "MEtalborg Black doctor", and rest it.
3-I choose apply the AUTO effect of Sin Buster.
My doubt: accord to the rulings, first is resolved the "When this unit attack", before the add of power of the boosting unit behind, so in this case, the effect AUTO of Sin Buster do not apply??

Thanks in advance and sorry for my english, is not my native language.