Bingowings said:

ANH Message : No matter how exotic human civilization becomes, no matter the developments of life and society nor the complexity of the machine/human interface, there always come interludes of lonely power when the course of humankind, depends upon the relatively simple actions of single individuals.(Ben gives up his life so the Falcon can leave. Artoo carries the plans to the rebels, the one man fighter finds the small exhaust port and destroys the metal moon and it's planet smashing weapon, Han changes his mind and saves Luke.).

ESB message : Fear is the mindkiller. Fear motivates almost every major action in the piece. It leads the characters into peril and overcoming it leads them back to safety.

ROTJ message : There is probably no more terrible instance of enlightenment than the one in which you discover your father is a man — with human flesh.

I agree with your ANH analysis, and fear does play a big part in ESB. But really, the "father is mortal" message of ROTJ doesn't take into account most of the actions in the movie.

The rebels underestimate the Empire's new battle station, the Imperials underestimate the Ewoks, both Jabba and the Emperor underestimate Luke's power, and Vader underestimates his own good side. This theme seems to be played again and again.