Whether or not one subs to the multisport pack is immaterial. If one resides within the territory of a team, those games when televised "should" be available. Now if FS Det is NOT part of your assigned RSN's , if you subbed ot the MSP, FS Det should be not blacking out the Tigers games.
I figure if a team claims your area as within its territorial boundaries, the team's RSN should be part of you local RSN's.
For example.
I reside in the territories of Braves, Nats, Reds and Orioles.
As such. FS South is a local RSN here.....Now The Reds are on FOX Cincy..That RSN is NOT part of the local RSN's here. However the games are assigned to the Sports Alt channels. I see them there.
And of course, MASN which carries the Nats and Orioles, for some reason is also a local RSN here. Weird....
I sub ot the MSP. So I can see the Reds on FS Cincy