Dreadstar is similar, the title was published continuously but changed publishers from Marvel to First in midstream. The database treats this run as just a single title.
But Tarzan starts out as Tarzan (Dell), then goes to Tarzan (Gold Key), then goes to Tarzan (DC). I don't know for sure, but I don't think that there was a break in publication for the title, so it seems that it may be fairly analogous to GI Joe ARAH.
I am guessing that the CB editors handle this on a more or less case-by-case basis. To some degree, I am fine with this. For short run indie titles that might have hopped around amongst a couple of publishers during their brief lifespan, I think having multiple titles in the database is overkill. But for much longer runs (Tarzan, GI Joe ARAH) I can definitely understand the reasoning behind breaking things up by publisher.
The situation for GI Joe ARAH has been in the database this way for many years now, so the rationale of "we don't want to mess up people's inventory" might be invoked here. But now we have the "automatching" function.
@Peter R. Bickford @Mark J. Castaneda thoughts on this?