Wexter said:

Saying that Ewoks are the same as Jawas is crazy. Jawas are mostly background entity that serves as a plot device for the droids to get from A to B. Ewoks are the reson the Alliance managed to defeat the Empire.

Like Ewoks contributed to the destruction of DS2, so did Jawas contribute to the destruction of DS1. As I said earlier, if Jawas didn't pick up the two droids in the desert they would easily be spotted and captured by imps and the rebels would not get the plans. This is completely equivalent to Ewoks providing distraction for the rebels to blow up the bunker and eventually DS2.

As I already said, they may have been a reason for Alliance to win the battle but they sure weren't the reason for the defeat of empire. My previous post explaining that:

imperialscum said:

And anyway the crucial point of Empire's defeat was not destruction of DS2 but the death of Emperor (which is entirely credited to Vader and Luke's influence on him). If he didn't kill him he would probably have escaped (even if DS2 was destroyed). Note that Emperor was not a proud guy like Tarkin, that he would stay on DS2 when there was a clear danger.