The typical redpointing pattern I see all the time is:
Climber trains for project,
Climber gets on project and starts to work it - moves feel hard and they haven't got the best sequence, so they're effectively bouldering on a rope - training strength.
Climber refines sequences and starts to do links - training endurance.
Climber continues to train midweek for project.
Climber starts to redpoint, efficiency is better on the moves as they're now wired, rests are bigger between redpoints, less climbing is done on a redpoint day and midweek training sessions are reduced in order to be fresh for the weekend, so the training effect on the route is less and the actual volume of climbing done is reduced.
Climber starts to go backwards on the route and wonders why...
My experience from my best years has been to train when you get home from the crag so you don't have to worry about the reduction of training stimulus on crag days, and to not take your foot off the gas when training midweek, during my best year all my hardest redpoints were done after only one rest day when I was still sore from training.