Uh... here's an interview with one of the developers for
Zelda's Adventure:
Duke Serkol: "Lastly was this game intended as a sequel to some specific previous title? I ask because the other two CD-i Zeldas seemed based off the cartoon, because of their characters (like the king) and therefore the NES games the cartoons were based on (Impa, for one, is not in the SNES Zelda), so I consider them as intended sequels for the NES games.
With Zelda's Adventure however, I was never able to tell if you guys intended it as following the previous two CD-i titles (which would answer the question of what ultimately happens to Ganon after being sealed in the book) or as a sequel to A Link to the Past (since Zelda wears the exact same dress as in that game's artworks, but Ganon was supposed to be dead after ALttP)... or as a standalone game without ties to any other Zelda in particular, which I suppose may be very likely."
jimby: "ZA was never meant to be a sequel to the other CD-i titles; in fact, what Philips did was farm out the Zelda projects to three different developers and got three different games. We may have seen a little of the other CD-i Zelda games during development, but it didn't influence ZA at all."
So, it's possible that the other two CD-i games were developed to connect to LoZ/AoL, but ZA wasn't meant to connect to anything, so that's one less CD-i game we have to worry about with regards to the timeline.