A trivial followup:
I recently built 3 SoKs. I know the order there were built by how they were positioned. Those three get motivated first, in the order most recent to oldest. By watching which of the other SoKs (all are the same Era) get motivated in what order, i was able to arrange all of them in a line. The motivation order has been the same four days running; newest to oldest.
However this order of SVRs stays random within the Era.
As I said. Trivial.
When we tested things, back in Easter 2015, this was exactly how the SVRs used to get AIDed—most recently constructed first, the building's age did not matter. But like I said that was before a lot of updates have been implemented.
And I would agree that this behavior among VARs (SoKs and the like) is trivial, since they all get pulled to the front of the line anyway. However, this behavior, as applied to SVRs, is much more significant in a lower-age heavy questing city (Colonial, HMA, or Bronze) that has a lot of expanded land with a lot of houses and supply buildings on it. That is how we ever noticed how the AID priority happened. During the 2015 Easter Event, players needed to build a large field of decos to have enough places for guild mates to hide eggs. Yet these cities also required motivation on coins and supply production buildings. Many players built lower-age decos, in the hopes that AID button clicks from friends and hoodies would skip polishing the lower age decos and hit their higher-age coins and supplies production buildings instead. And that would leave the lower-age decos available for guild mates to hide eggs in. Well, it didn't happen that way at all; the lower-age decos ended up consuming 2 AID clicks each per 24 hours, while higher aged coins and supply buildings went un-aided. This was the very reason why Inno Games was bombarded by an overwhelming number of complaints about how the Easter Event used to work and why they eventually changed it.
If it didn't work the way my 2015 Article documents, there would have been no need at all for Inno Games to have changed the Easter Event—all a player would have had to do was build a dozen or so Stone Age trees for egg hiding and the rest of their city would have gotten aided.