Unstopped fighters who were far from unstoppable...

That's why it wasn't a reply to your OP, but to people touting the likes of Hagler and Toney as 'unstoppable'.

I mostly agree with your OP, I just think you go way too far in the other direction in selecting evidence to say that fighters who have fought numerous fights at world level and never been stopped could 'easily' be stopped by a selected opponent. That's very much reaching.