I was looking up some stuff from the UC and I was shocked, and frankly a little annoyed at the number of links to non-UC units that claim the RX-78-2 as an ancestor. Yes, most if not all of them call themselves "gundam," but so does one or more unit in every single other continuity. Saying that the Ryubi Gundam is developed from the RX-78-2 Gundam is like Memory Alpha's page on the TOC Enterprise mentioning that it was developed into the Protector from Galaxy Quest.
I submit that the Developed From/Into and Variants sections only contain entries from the continuity of the article in question.
Build Fighters is a thorny can of worms because it's so damn meta. Ultimately, I would classify it as it's own continuity, with a one-way connection to the source cannons from which it draws. The Star Build Strike can claim derivation from the Strike, but the converse does not hold.
I'm planning to separate that when I have the time to code it.
On a related note. Should mobile suits that appear in multiple continuities only have "<continuity>" Mobile Weapons" for their original continuity or all continuities they appear in (with their original being placed first)?