The 91 service is a footnote to the 90 service
"Route 91 - To and from City Centre and Heuston Station only. This service operates in conjuction with train arrivals and departures from Heuston Station."
It seems like the 91 operates as an on-demand service.
I think you might be understanding things wrong, don't forget the 92 is a different fare to the 90/91 (1.50 for the 92, 1.30 for the 90/91).
I haven't tried my ticket on a 92 bus yet.
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