Those two calculators you linked are actually the ones I've been using, but thanks anyway.
Also this this build is supposed to work for enemy phase, hence quick riposte, fierce counter and vantage. I also think that while you're right about part of Ophelia's appeal being crits, it's definitely not what makes her as good as she is, what with all of her best mothers giving her terrible skill. I think most people agree that what makes Ophelia good is her high magic, high speed, easy access to damage stacking skills, and then her crit chance. Forrest has an even higher individual magic growth than Elise!Ophelia as long as he has Corrin as a mom. Furthermore if you can get him into the Dark Mage class before promotion he may actually have a chance of eclipsing her in magic. I'll have to check later.
I can too see where you're coming from with the sealing expenses and what not, but this game honestly gives more friendship seals than needed, and it's not like you have anyone else to spend them on aside from Leo, Selena, and maybe Xander or Camilla? and better yet I could wait until after he gets elbow room to seal him into a dark mage so I won't really have to seal back.
I also just might pass down quick ripostle myself from friendship with Selena...
Also Siegbert and Forrest could always do attack stance shenanigans to get supports.
What do you think?