I'd go for Dr. Marco... I'd also have the method of interaction be that when Ed gets punted post series he ends up in Germany in Nanoha's time. The TSAB gets the gating in on scannerst. They find Ed and after a while find his home world and give him a lift back. The lag lets Ed weasel magic lessons out of them to replace his alchemy. They drop Ed off, bringing Nanoha and Fate along for the ride and then meet Ed's family group... leading to some very, very awkward questions like, "Mom, if I have a sister... why haven't you mentioned her at all?" Then go into flashbacks and story telling of the past. Story time leads to Ed making comments about how Precia is still less of a bad parent than his dad.
Alternately, The TSAB tracks down Precia and gets in orbit about ten minutes before the culmination of the end game of Brotherhood starts up. Nothing like a planet with tech that backward forcing space craft into brown trousers time.
Alternately, The TSAB tracks down Precia and gets in orbit about ten minutes before the culmination of the end game of Brotherhood starts up. Nothing like a planet with tech that backward forcing space craft into brown trousers time.