It could, but I have a few objections.
1) Can anyone really claim to have more genetic compatibility than MC who is literally connected to an Arbiter?
2) MC and Jake had similar growth rates and they had to deal with Ella. MC during his first 2 months had to fight a monsterfied superhuman, a level 2 (Danica) and Klaus who had his power for far longer than him. Jake had to use his powers against level 5s and he was under constant distress due to the Mia situation. Shen on the other hand seems to like positive reinforcement and Devana in particular seems of the happy-go-lucky sort. I doubt he was harsher than Ella.
Hmm, I really thought that Charlie has been a superhuman for far longer. Oscar joined the Aldains about the time Klaus turned. So that's 6 months. Since then, another 6 months have passed. This is what the narrator during Michael vs Oscar
"Long forgotten nostalgia", "long while". The narrator makes it sound like years. We also know that Charlie and the Wepwawet's corpse were gone after Oscar woke up.
So unless I've missed something, I don't think it's a stretch to think that Charlie has been a superhuman for quite a while longer than a year. Add to that the fact that children tend to take better to it, and we have a winning combination.
Another thing to consider is that "ten times stronger" could be something of a boast. She could be 5-6 times stronger instead. It's a low threat environment, for both Charlie and Met who just met someone familiar.
As for the level 3s in the building, of the new recruits, that would only be Met and there were probably at least 20 recruits there. The numbers check out according to Ella. So I don't find it that far fetched. But then again I have to leave every scenario open because it's not the first time MC has been wrong or the game tried to tell us something that just isn't true.
What can I say. The simple truth is that I'm still butthurt from MC's performance, so I'm looking for explanations