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Which Jonas took Mikkel to the caves?
(Dark S2-S3 thoughts)
Usually there are two opinions - either it is Jonas after his trip to another world or it's Jonas from his travels with Claudia.
We know that time is linear within the loop, if you travel with a help of the passage or the time apparatus. Only the God's particle can break the rule of linearity, and can take you whenever you want /to some random time. And we still don't know how Martha's golden sphere works, and what can it do.
Ok, let's jump into the "which Jonas..." discussion.
In my opinion, Jonas who got Mikkel through the caves is probably Jonas from his year with Claudia. Let's briefly recall the events supporting this idea:
So Jonas 2020 returns on 20-21 June of 2019 through the Dark matter bubble. He kisses Martha, already being 1 year older than her at the time (if it's safe to presume they were born in the same year). He causes Jonas 2019 and Martha to make love and then goes to save his father. That idea fails, as Michael tells him that Jonas from very near future gets him through the caves. Claudia appears, and Jonas 2020 leaves with her to linearly travel in time by 33 years cycles. So I assume that in 4 and a half months he returnes to show Mikkel the way and then continues his travels with Claudia. When he returnes home in the day of the Apocalypse, he still is at least 1 year older than he should have been if he would not traveled in time. Then Martha finds him, Adam finds them, Martha 2 finds them too (Seriously, Jonas, were you even hiding??) And they travel to another world to which we have 1001 questions to ask. We don't know how the time-space traveling works there – do they have a loop, and how can you time travel, linearly or not? We still have no idea for how long Jonas is going to stay there, or when it will be safe to come back.
That's why I think the Jonas from his "travels with Claudia" time is the one who gets Mikkel to the caves.
So, untill proven wrong by season 3, it seems like a solid theory to me:)
Let me know your thoughts in the notes section:)
Is the boy on the right - Mikkel? So, regardless of the fact that Katharina might be pregnant, which is doubtful, Mikkel from the alternative world have never disappeared? Ooh... That’s why there is no Jonas in the alternative world, the world Claudia saw! It makes sense now! What if in order for Mikkel to stay, there are no tunnels in the cave, because Jonas has never existed in order to start building them. What if they do not have a time loop? Nevertheless, they should have a “Something”, cause they have an apparatus that travels between the worlds, and also probably in time too, because Martha2 was able to arrive to save Jonas by taking him to another world seconds before the Wormhole devours Winden...
hmm... I think I have made way too many assumptions from an appearance of a unknown person’s back on a photo.
I can’t stop making theories about Dark Season 3...help...

Oliver Masucci @oliver_masucci spoiling season 3 a bit. Magnus, Martha and pregnant Katharina. Though according to his answers it is just a bit of fun playing around but then theories :).