This the story of what has happened to the European transition from communism to liberal democracy in general.
Orbán's story is the story, in a way, of the whole region. He begins, as you quite rightly say, as an anti-communist insurgent, and has—all credit to him—a very courageous role in calling for the withdrawal of Russian troops in 1989.
I think he then begins to see that there's a space on the right that is not occupied by the liberal transition elite and, like a clever politician, begins to flow into that space. I think he's influenced by international tendencies. He starts as a CSU Christian democrat conservative on the German model, and then begins to move steadily to the right.
The question of how far right he will go is a question of how far the European institutions step in to restrain him.
I think he's trying to perfect a kind of Christian democracy mark 2—not the Christian democracy of Adenauer or De Gasperi in the post-war period, but a Christian democracy in which Christianity is really a symbol for hostility to Muslims and foreigners. Whatever else Christianity is, it's also a language of mercy, but you don't hear that very much.
As for your question about Visegrad, I think he is a model for the Poles; they have adopted some of his actions on the Constitutional Court of Hungary very directly. I think the Czechs are much more reticent. I think the Austrians like his immigration policy, but don't like some other aspects of his illiberalism.
I would not overemphasize his impact in the Visegrad Group.