Bye week in the opening rounds doesn't have quite the same impact. I would argue that Wasps' bye in week one was a disadvantage if anything as they were coming off pre-season, up against a team who already had one competitive game under their belt. Once you're 4 or 5 rounds in, then the bye week does offer a great opportunity for the entire squad to rest, refresh and recover.
After round 4, 9 of the next 10 rounds had wins for the team that had the previous week off.
Not sure what Borthwick's moaning about though as they've won all 3 of their games against "rested" teams so far this season. However, the schedule should have ensured that all teams play the same number of games against teams coming off a bye week, and it's certainly not right that Sarries play Leicester after both of their bye weeks. Since it looks like we're stuck with a 13 team league for the foreseeable future, then PRL definitely need to look at this.