So it seems like a lot of posters are conflating taper, peak, and rest here. Peaking is just a phase of a normal periodized training regimen. Most good training groups incorporate some type of peak phase before championship season - usually work at or below race pace - and I'd imagine Brosnan's group is no different.
Taper refers to a reduction in training volume (while maintaining the same workout style) during the days or weeks leading up to a big race as a means to catch the rebound off of a big training block and/or offset any impact from accidental overtraining over the course of a season. Taper can be super important for elite athletes because they spend decent chunks of their training blocks right at the red line, but the idea that MOST athletes need a taper is one of the most annoying and pervasive myths of high school sport. If you feel fully recovered going into most of your workouts you probably don't need to be tapering. From what OP wrote, its unclear whether Brosnan runs a taper, but given how quickly his group jumps back into workouts I'd guess most likely not. As to whether his top group even needs a taper, that'd be impossible to say without having a pretty detailed training log and knowing how his athletes handled the workouts over the course of the season.
Rest between seasons is pretty self explanatory right? Clearly the NP group doesn't drop to zero, but a five miler and some 62 second 400s could very easily be an off-season workout depending on pace and rest between repeats respectively. The majority of coaches would recommend some kind of recovery phase, but there have been legends that don't run for months and others that that do 2 weeks of light training before jumping straight back into it. Seems like Newbury leans more towards the latter, but whatever they're doing its clearly working pretty well. Would love to get some more detailed info about their training.