They were referred to as the Chosen. All of them being pure 1st generation monsters from an Apostle line.
These monsters are likely not working for SIN or being controlled by them. Three of them don't even care about Ella all that much and only listen to her because she's a fellow chosen. Those being Aglaecwif, Rebis and Valravn. Aglaecwif herself willingly went against Ella orders just to spite her and to follow her own self interest in the MC. Rebis flat out rejected working with her, according to Deryl. We all know Valravn only cares about his Lord.
So in my own view of it all. The Chosen aren't actually on SIN side. They're much more powerful than all of them and the chances that Charlie, even at Level 4, can control them is slim to none. The same goes for Zara's marks. They're just guiding them along until their Apostles arrive.
I also don't think Ella's plan actually align with SIN's but that's a whole other subject. Especially since they don't know about the doll and the fact that Tanos has powers similar to Rebis but she went to Deryl instead for the Heart. Though, Doll Ella could be also waiting for the chance to absorb her power from the tree and absorb her original body once the negative energy wears off. That would explain why she's still lingering around HERO's base.
At least, that's how I see it currently.
I too don't think that they are on SIN's side. I'm just trying to figure out why they even bother with them. Hex in particular is literally SIN's lifeline. There is no way SIN can survive outside the dimension or without it's teleport and blocking capabilities. Tanos' research on twins may be a reason and having access to SIN's infrastructure could be a boon, but I kinda find it a stretch. Yet the monsters play well with them and even do their bidding instead of being more controlling.
Btw I really don't think that Charlie is a level 4. I have 2 reasons for this:
1) She looks like a child. This is further augmented by both her sprite image name being ycharlie (meta reason, y almost always stands for young), and how Shen's body matured when he reached his 4th (in game reason)
2) I think it's fair to assume that MC as a high compatibility superhuman can gain more power than other superhumans. If that's true, then it's possible that Met has significantly less power, to the order of 100 to 150, despite having his power for a similar amount of time. If Charlie has high compatibility and had her power for 2-3 years, she could have easily accumulated around 1000 power.
So having 10x Met's power as a level 3 could be a very plausible scenario.
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This didn't make too much sense when I read it, but assuming that Evander is level 3 or an unnaturally powerful level 2, perhaps it's very significant. Still it shouldn't explain how a level 2 can go against a level 3 that easily, due to level 3 strengthening the body too, but anyway:
Monster Church guy said:
Male "You are the children of the Eleventh and the Twelfth. Twins, just like the gods themselves. You are their chosen!"
show devana n with dissolve
Devana "Oh.... Neat."
Evander "What nonsense."
Male "I understand your scepticism, but look no further than your own unnatural growth for proof of my words."
Male "One evolution, both bodies rise ascendant!"
show evander st with dissolve
Evander ".....How did you know that?"
1) Unnatural Growth
2) One evolution, both bodies rise.
This is cryptic as fuck and the implication can create an infinite loop, so we can't know exactly how this works.
Some possible interactions:
1) When 1 evolves, the other evolves too.
This is a bit iffy cause it could create an infinite loop. For example, Devana evolves, which causes Evander to evolve, which causes Devana to evolve, etc.
2) When 1 evolves, the other gains a similar evolution boost.
The siblings were training for 1 month, and they both have accumulated 10 power.
Evander evolves, which gives him 20 power.
Now they both have 30 power, but Devana is a level 1.
Devana evolves, which gives her more power and Evander instantly benefits from it.
a) For argument's sake, let's keep it at 20 again.
So now both of them are level 2 with 50 power.
b) If we go by my theory of 3x, Devana will get 60 power through her evolution, so both of them will reach 90 power.
This would put them at a power level similar to MC when he fought Valravn.
On the other hand, if Devana and Evander have unnatural growth due to them being apostlespawn twins, then it seems kind of odd that MC, who is literally 2 in 1 and connected to an Arbiter, can't casually annihilate level 4s by now. But anyway.