Sure, if you float someone, they can't push back and they are off balanced, even if they don't quite realize it. You can then make them feel really off balanced by putting them into a hole (a direction in which they are weak). Most of the aikido waza I recall, don't force the person to move in a direction in which they are innately strong.
Even if they person tries pushing harder or leans on you at that point, it just makes it even worse for them.
I'm really too inept in aikido as well as in internals to say much about floating, but I'm going to do it anyway.
Floating someone requires you to get under them. My thinking was that the ability to resist a push internally greatly enhances the ability to float someone who is not cooperating.