Seems Mercury had a Semblance, but apparently his dad had All For One or something and stole it. Tyrian's tail is neat, but it's also confusing since we saw back in episode 3 or 4 (can't remember which) when the Em/Merc/Haz arrived back we saw him with a normal tail and the robotic tip; now that it's fully robotic it feels odd.
The big point of the episode though was definitely the part with the statue. Seen some theories going on as to who the woman might be, but I'll stick to the common thread of Mom since there's really no need to make a conspiracy theory out of the moment right now and Mom makes the most sense out of possible identities.
The plan to get to Atlas is pretty damn risky, as the plan I had thought would go would be as stowaways; though admittedly a party of like... 9 or 10 at this point would be a bit difficult to pull off in that way. I get the feeling someone isn't making the trip and getting arrested.