You know, when I played MvC games, I didn't care if tiny little Servbot handled Thanos, or if Cammy pummeled the Juggernaut. I think the need to justify why certain fights can happen is not really necessary for fighting games.
The amusing part is that they had an explanation for Superman, Captain Marvel, and even one for why the Joker is suddenly able to kiss people's ass with his bare hands, but they forgot (or couldn't find a way to) explain why Wonder Woman could be beaten up by Liu Kang (who is just a very very good martial artist, after all).
"I'm going to paraphrase Nietzsche, when you judge a work, the work judges you."
Alot can happen in 5 years. My money is on s last-second rescue, and Lois (and the baby) die 9 months later in childbirth. Superman feels responsible, goes nuts.
The childbirth scenario reminds me of one of the Armageddon 2001 Annuals, except there Superman left Earth & hooked up with Maxima.