End of season 2 question!

Hello! First time watcher, just finished S2 (please no spoilers!) came to The Americans after Homeland and so impressed with how tightly written/plotted it is, and how I have zero clue where things might be going. I did have a few questions about the S2 finale though.
I've scanned the Reddit for answers already but I'm not sure if I've missed these ones.

1. Presuming Larrick tracked Jared because he's also now KGB (so found him via the phones like he did with Kate) - why did he stop at Jared and not pursue that same course of action til he found Phil and Elizabeth's line directly? It seems like an unnecessary extra step to go to him to wait for them to show up?

2. How did he plant the tracking device in Jared's backpack?

3. That scene in the car with Jared and Elizabeth where she specifically says to him to bring all his belongings back to her but we see Larrick fish the backpack out of the bin outside the toilets...are we supposed to assume that Elizabeth dumped it for him? Why?

Any insights would be so helpful! It's the first time in two seasons I've been tugging at apparent loose ends and I hope I'm wrong!