I'm not sure why you're turning this into an argument, but I'll just clear up something you misread:

defeat of some of, what are supposed to be, the Empire's best forces.

That's what I said. I did not say they were pivotal in the defeat of the Empire (though, I guess they are when you look at it your way). What I'm trying to say is Jawas never killed a bunch of Stormtroopers (other way around, actually).

Also Jawas didn't look like teddy bears. They actually don't even look that silly, when you think about it.

Also, I looked at ANH, Jawas first appear about 12 minutes in, then disappear about 19 minutes in. So yeah, 7 minutes. Ewoks are in ROTJ for considerably longer than that.