Calm down everyone
A lot of people seem ready to hate on this show for poor writing because it didn't go exactly how they wanted it to. I think Lydia remembering to the point at which they succeeded at breaching whatever limbo Stiles was in wasn't necessarily a result of her having a stronger connection per se... but of her not freezing to death before it happened. You know, 'cause they tried a new tactic. Also, it could have been because that tether was established with the three people he was closest to, as well as having been established with his dad a couple of eps back.
People keep accusing the show of being illogical, and it truly is at times (take last week's brand new take on Claudia's death, for example), but it's almost as if every non-Stydia shipper felt personally attacked and triggered to the point at which they flat out refused to see the bigger picture. Inb4 you guys assume, I was never a shipper of Stydia. I'm never a shipper of anything but the writers laid the foundation for Stiles and Lydia ending up together as the endgame long ago. I'm cool with it.
I very much liked the episode, I liked the fact that we got to look back on those more powerful moments between the main cast. I also enjoyed the Liam and Theo parts. Who else has noticed that anything involving Liam is FAR better without Hayden?