Completed Act 5... Can I use these champs from Act 5 rewards in Act 6?

Act 5 completion rewards:

Act 5.4 exploration rewards:

Not sure how to feel about this. 'Coincidental' I guess

Act 5.4 exploration rewards:

Not sure how to feel about this. 'Coincidental' I guess
6
Comments
EDIT: actually pretty sure i didn't as it's atleast two clicks
Side note: Red Clops may have become a troll pull, but he still has dependable Crit.
I am Elders Bane.
i have been playing for just over 2 years.
i have 2 x r5 5*.
I have still yet to touch LOL or Varient difficulty Ultrons Assalut.
I have just not done LOL as i just havnt felt like sinking the time and resources into it. I mean i do have thousands of units and 5/65 dusa + royal family so i Could do it but just have not been bothered yet.
I have not done Varient yet because i have not even had the time to look at it so i dont know if i can or cant do it yet.
I didn't matter how good a 4* is, it can't be used in act 6