Lanefan
Victoria Rules
If the bolded is to be consistent with itself across the entirety of the fiction then those minion Ogres have one hit point no matter what they do or who they fight, meaning one of them could be taken out by a determined kitten with sharp claws and easily one-shotted by any of its buddies during playful rough-housing.This is the second time I have seen this claim. Do you have source?
Monster Vault do not have minion ogres. Monster Manual has minion ogres, but these are fully different stat blocks than the non-minion ogres. The "level" is basically an indication for when the monster is considered aproperiate. You could throw an ogre minion at a 1st level group, having them so demoralised by their overlord that they don't care about pressing the issue if the group actually managed to harm it (no small feat given it's defences). You of course bypass all encounter building guidelines by doing so - but there are no real internal consistency issue appearing as far as I can see?
So with what mechanism are Bob transitioning from elite to minion?
Remember the elite ogre is elite among ogres. The minion ogres are those with not enough spine to rise in the ranks beyond minion state. But as the minions typically is encountered in large groups, they are typically aproperiate to use against higher level heroes.
As I really don't think that's what the designers intended, the only other explanation is that they're not minions all the time. And that means changing their intrinsic mechanics to sometimes make them not-minions, and that's where I find a problem.