Its quite a few years of quests not done and all steel path that I'd lose haha so its a tough call, but I wouldnt mind redoing the quests and steel path if I would be at a disadvantage by not choosing the MR25, thats why i wondered if the MR would add together from all in the codex (I really hope it does)
If i go with my MR19 with all quest progress, and then all my MR25 codex is added, then ill be at least MR25 with quests up to date - this is what I am hoping anyway