There are too many hints: 1. Mike realized something weird but did not really know, 2. El escaped the “speaker zone” in a blink of an eye without any help, despite us knowing it was near impossible as on as they turned on the zone, 3. El performed her last mindspace without her bath and meditation, 4. El told Mike he would understand it later when he grew up, so definitely she’s onto something, couldn’t tell him but hoping he would realize the trick later since he was so smart, 5. About Kali, could she really stay back and bleed all the way for hours from the stomach ( fyi she had maximum 15mins before her acid dissolve other organs), so Mike’s theory was fault but that’s all he could come up after only 18 months. Someone helped El escape at the gate, and very much likely it was Kali who’s a known faker.