I agree. That's what makes it too heavy....I get the intent, they couldn't find an interesting way to do the setup so they glossed over it; but this was too much to try that with.
When Luke's recovering from being half (or more) frozen, after the bacta immersion, Han tells him he looks strong enough to "pull the ears off a gundark".
Again, I agree.
Ahsoka actually talks a little about how sensing people "works" later on, in season 3.