Stalybridge and Guide Bridge also used to be places where a fair number of connections could be made as part of longer journeys (via regular Stockport / Stalybridge trains). However, both these stations have always had a healthy amount of Manchester area local traffic too, so maybe not "... completely different purpose ..." here.
Yes I'd agree with those two.
In fact it's interesting - the railway line between Guide Bridge and Stalybridge was, when built, actually in theory just a branch line built in the 1840s by the Sheffield, Ashton-under-Lyne and Manchester Railway - a branch off their main Woodhead Line. They are the ones that built the station in Stalybridge but around the same time a new line was built by the Ashton, Stalybridge and Liverpool Junction Railway from Stalybridge to Manchester Victoria anyway.
When the Huddersfield line was opened in 1949, while it naturally made the Stalybridge to Guide Bridge line look like a 'mainline' on a map, it wasn't primarily used for that purpose and in the years thereafter the main function of the line (and therefore both Stalybridge and Guide Bridge Stations) was still very much a local branch-type line for Stockport to Stalybridge services rather than longer distance services coming to/from Yorkshire (which primarily used the Stalybridge to Victoria line).
Nowadays of course all different - Guide Bridge is now just a local station on the Hadfield Line (and Rose Hill Marple services), whereas for Stalybridge, the earlier importance of it being an interchange station for the Huddersfield Line for passengers coming in from Stockport certainly helped nail its location as one of the areas more important stations and thus ever since it's always been served by a fair amount of longer distance services i.e. Scarborough and Liverpool Lime Street, in comparison to most other stations in the nearby area, and what was built as a branchline off the Woodhead line, the line between Stalybridge and Guide Bridge is now very much a main thoroughfare - regularl Stockport to Stalybridge services have long since ceased owing to a certain Windsor Link.