Not sure if this an an anomaly of the 2.0 update via the retooling on the in-game unit guidebook (animation playing is sweet btw), but I noticed an interesting trend.
On all the 5* global exclusives, you can now "see" the holes in the unit guide where their eventual 7* upgrades will go. (PAD was notorious for doing this in its earlier days, making this very obvious for me to spot.)
So the 7* unit numbers are...
Demon Rain --> 8002
Dracu Lasswell --> 8005
Elza --> 8014
WK Noel --> 8017
Yun --> 8028
Olive --> 8041**
** Visible unit guide ends at 8040 (Olive 6*) currently. Given the very easy to see trend in the guide, there should be a invisible 8041 spot for her 7* already there but is not verifiable at the moment until the next global exclusive unit is pushed to the client.
As the devs have said that they want the seasonal events to be repeats, that should mean that 7* Halloween Rain/Lasswell should be coming in about 8 months or so
Also, this lends weight to a theory that I have had for a long time that only natural rainbows will be eligible for 7* upgrades (no currently existing global exclusive gold crystals that can reach 6* have a 7* spot reserved in the unit guide). By the time the game reaches the need for 7*, there will easily be enough units in the draw pool to avoid needing a 4-5-6-7 upgrade path.
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/randommusings