Which has nothing to do with assuming or not assuming responsibility. This is known as moving goalposts.
You'll notice I've said absolutely nothing about whether or not he assumed disproportionate amounts of credit. That kind of thing is murky at best. How do you measure credit? Is it something your boss gives you because he likes you or is it something you actively vie for? In some cases it can be one, some the other but in most cases it's a little of both.
You still haven't admitted even a little bias, despite being shown your quite obvious bias in at least one context.