What if Russia built a Rurik-style armored cruiser with six twin 10-inch mounts?
Short answerInvincible still has enough 12-inch firepower, but a stronger Russian armored cruiser would put pressure on Germany not to be visibly outpaced.
NotesThe design question separates British and German reactions. The Invincibles remain credible because their 12-inch guns give them the firepower margin, whatever label one applies to them. The more interesting consequence is German: a heavily armed Russian armored cruiser would make it harder for Germany to accept being outclassed by another continental navy.