Norah and Martha told the MC they wanted to have the talks with their daughters alone while the MC is with Eva. I think it makes more sense to do it that way because:
-Story: It's been Martha and Norah who hid the (part of the) truth (they knew about). This is more relevant in the unpatched game since the portion of the truth they know is bigger.
-Game: Does anyone want to see the same conversation thrice only to see Emma, Daphne, and Erika's different reactions? I think it's better if those conversations are done off-screen and the MC sees the results when he gets back from his lesson. Remember that Meemaw, Betty, and the students will see the "triplets" at home too, so they also should be informed.
Eva is as fun to write (but a lot sadder) as Emma. We started to see her true self in the last update. There is much more in the next one, with things that (I hope) will surprise some players. The shooting lessons, although logical from the MC's PoV, are only the (writer's) excuse to have time alone with her regularly.