If in ANH the empire wouldnt consider a small fighter as threat then probably in ROTJ they took this fact more seriously. not only heavy lasers but even more smaller could take out small fighters easily. Taking the concept ramming the executor on one part of the station if can make a defense free spot for the fighters to enter.

I've always assumed that was already the case. Walks down the stairs, as we can't see his hand he calls it and immediately ignites it.

You can see the saber's shadow tho. I like the idea of the force returned saber :D

-Berry