I do think Scunthorpe need to keep hold of Harrison but is staying at Scunthorpe good for Harrison? It maybe beneficial for Harrison's career to have a year or two away from Scunthorpe and learn a different track by riding it week in week out.
I don't think a rider staying too long at the same track is any good for them as they become one track Ponies like Lambert (could argue he's a no track pony atm).