Yeah Matt Nagy is a really under the radar guy. I know he was a nobody QB who was in training camp a few years back and I don't think he ever made the team but has been on the staff.
When Reid first came to Philly he had a lot of young, bright, up and coming coaches on his staff and it worked. Then in the later years it seemed like he was bringing in veteran coaches and it didn't. He might be trying to do it the way he initially did in Philly, by identifying bright, young, energetic guys like Nagy and Pederson. Don't forget, Reid himself will pretty run the offense.