More basics, but here we tackle one of the weaker areas of these games: why Professor Juniper picked the hero/heroine without ever meeting him/her. Most of the other Pokemon games do this in a reasonable manner. The main character is a neighbor to the professor, does something for him/her, and/or has enough positive contact with the starter Pokemon to impress the professor. Here, Juniper does know the main character's mom, but it seems to be as an old friend she hasn't seen in a while. It's odd.
So it makes sense that somebody had to recommend Nate or Rosa to the professor. The most reasonable person would be a teacher, but it could also be the result of some essay contest, test, or such. Cheren is a possibility, but actually unlikely, give how he introduces himself when you meet him. It would make sense for him to recommend someone to Juniper, though. As for why I decided to go with him, this sets up a friendship between Nate and Cheren (and Rosa too) which makes the first Gym battle more significant.
Actually, I haven't made it to post-game in White 2 myself to know if there's an explanation of why Lenora stepped down. But this just makes sense.
My commentary had to go on the next page, lol. Chapter 3 is back a page. Also, I should have the thre of you added to the PM list shortly.