The South Route should be abandoned for deployment of 68s. Whilst Manchester Piccadilly drivers sign Liverpool to Sheffield, it's Cleethorpes drivers who sign Sheffield to Cleethorpes. Training is behind for them, and those that have been trained put reviews in for them due to not getting on them quick enough, as the diagrams haven't produced a 68 frequently enough.
Cleethorpes, Sheffield and Manchester Airport guards sign all or part of the route, and apart from Manchester Airport guards who have signed them for years, the same training and competence issues affect Sheffield and Cleethorpes.
Where as full deployment on the North route to Scarborough is easier, as Manchester Piccadilly and Scarborough drivers have signed the 68s for years, York link has quickly caught up. Manchester Airport, York and Scarborough guards also sign all or part of the route for 68s. One issue with the 68 diagrams on the Scarborough route was route knowledge, which prevented the first 2 services East bound running as they used the diversionary routes which many drivers don't sign.
The changes since May was to abandon those early services being class 68 operated, and instead get the diagrams out on services that either don't require the diversionary route, or that don't require Castleford (which was the issue).
The 68s have their place, their 5 coaches are good people movers, they just need to be allocated to routes where the training is minimal - hence give up on the South Route.