Aren't tickets generally issued to 'Wigan Stns' rather than specifically to Wallgate/North Western? I imagine a similar anomaly exists with Wakefield, though there are trains between Westgate and Kirkgate. Likewise Exeter, although St. Davids to Central is a viable journey that someone might want to make, unlike the Wigan example.
Kirkgate- Westgate is also viable given that you can get a direct train between the two. They are a fairly long walk from eachother as well (I have done a connecting journey between the two for convenience sake, albeit on my metrocard