No one of them has as much brains in his whole body as Bentley has in his little finger.

请问这个句子是什么意思？as...as句式如何理解？one's whole body与one's little finger对比如何理解？

相关语境如下：

HYPATIA. Oh, I don't mind your saying that about Bentley. It's true.  He is a little squit of a thing. I wish he wasn't.  But who else is there? Think of all the other chances I've had!  Not one of them has  as much brains in his whole body as Bentley has in his little finger.  Besides, they've no distinction. It's as much as I can do to tell one from the other.  They wouldn't even have money if they weren't the sons of their fathers, like Johnny. What's a girl to do? I never met  anybody like Bentley before.  He may be small; but he's the best of the bunch: you can't deny that.