Thematically, I think we're more likely to see more Eden, and Pandaemonium references in Dawntrail as their stories deal with memory, and souls respectively. While the Alexander story does have a primal called Alexander, and does deal with time travel, it handles its time travel in a somewhat scientific way, and is more interested in time travel as a tool, and things like paradoxes. While Dawntrail is more interested in using time to explore themes like nostalgia, grief, and legacy. So I don't think FFXIV's Alexander has any ties to FFXIV's Alexandria despite the FFIX stuff.