Alby bringing back heroes to life in War

[littleKAF]

I searched for another thread to confirm what I said. Here it is.

How exactly does Alberich work in war?

I was under the impression that Alby could only resurrect heroes that were alive when that particular battle started. I just hit an Alby team with only him and one other left. I killed the other one. He powered up and resurrected everyone except the tank. I promptly died. When I looked at the team afterwards, only Alby and the one that was there when I started the battle were alive and the other 2 were gone. Is this a bug or is it intended. If intended, then that’s seriously overpowered.