3 and 4 - Nami is a year older
If it's 20 years, and Nami was held back a year, and it's the first year Nika can go to college, then, he's 18, which means he can't be a WiaB baby. Nami, Maja, Adrianna Vanessa, and the Revera on the first team could be WiaB babies. (If old WiaB has any sway, the Revera is almost definitely a WiaB baby)
I'm kinda surprised with how often people talk about the supposed parents without realising that almost the entire cast of SG have to happen a year after WiaB, seeing it's 20 years before, which makes almost everyone too young to have been the results of Willi's Wild Whippersnapper Making Spree TM ...I hope Ocean realises that too, or we'll have a cabin 6 hours from town in walking distance from a house that's maybe 5 hours drive from the town where Noji works, but close enough to the school so that Aquila hospital is the emergency Nika gets taken to when the incident happens....