Well, I disagree on that, I'm afraid. yeah, chibis have proportions that are extremely different, but I don't think it should be hard to tell what character it is if it's supposed to be a more realistic one taking on a chibi form. :/
What's the fun of making a chibi out of a more realistic character if people can't tell who it is?
actually Mino, I am sure he is saying the opposite. You make your chibis very recognizable, and he is saying that it is a good thing!