They interviewed a lot last year.... My guess would be for them to pick from that vs. ramping up interviewing for just 14 new hires..... I'm sure they have a ton of people to pick from for this year... I haven't heard of any future windows opening for this years hiring.

And they don't have a pool per se... Everyone that interviewed is technically in the "pool"... Ranked on a scoring scale...they take from the top of that list until the hiring needs are met... At least that's the way I've heard it typically operates, and was my experience with the process.