Hence the question, what do Hobbes and Hegel have in common ? I admit I know a bit about Hobbes having read the first two books of Leviathan (and I bet Hobbes's mom was too bored to read the third and fourth). About Hegel I know almost exactly nothing (and more than I would like).
They are two seminal influential writers. The vibrant discussion and debate about the social contract began with Hegel largely transmitted through Locke's attempt to refute Hobbes in his second treatise on government (I have read it but not his first treatise on government).
In each case, most people addicted to the big H's do not share their conclusions or general orientation. Some phrases and words live on (social contract, dialectic, historical age) while the orginal main point is utterly rejected.
The interesting thing is that these two genuinely revolutionary writers were reactionary. Both advocated absolute monarchy. Hobbes explicitly rejected not only the British revolution, but also the ancien regime with power divided between the King and Parliament. He regretted the defeats at Naseby and Runnymeade, he contested both Cromwell and Polybius. He slashed at the division of power as sharply as Ockham.
Hegel was not so clear (the military situation has developed not necessarily to Japan's advantage). He claimed to believe that Prussia should have a constitution, and that Prussia had a constitution.
I just had an idea. I think the extroirdinarily original thoughts are the result of attempting to defend the indefensible. There were a few obsolete arguments for absolute monarchy. The first was might makes right, which was challenged by facts on the ground. The second was the divine right of kings which was hampered by the contrast between God's stubborn silence and theologians' verbosity. Something new was needed and first the social contract then the dialectic were new. I think the radicalism of Hobbes was made necessary by his extremely reactionary factionalism. I think the extreme abstraction and vagueness of Hegel [should be discussed only by people who have actually read Hegel] was a new obscurantism needed because people had ceased to look to scripture for guidance on public policy (people starting with Hobbes).
Necessity is the mother of invention, and the painful and humiliating need to find some way to defend the pretenses of a royal patron was the mother of genius.