I will use invasion breaker fights as a way to earn mastery points for heroes. Often times I will use a couple of strong heroes with good abilities to clear an entire team and 3 to 4 other heroes which may not be my strongest, but who qualify for mastery point gain. These heroes are also the first to die and aren’t necessarily quick to find in a long list of heroes.
So I am requesting that any hero which is revived in Invasion mode be automatically re-added to your lineup if a space is available. It seems pretty straightforward; if you are reviving a hero it’s probably because you want to use them.