Ever wonder why only 63 out of hundreds of priests signed the union? Or why there were no bishops who signed? Could it be because the Orthodox bishops were all in jail? And, 63 out of how many hundreds of priest is hardly a majority. What happened to the 'majority rules' concept if this was no a forced union? My gradparents came from this union. They, along with each generation that preceded them, taught their children that Orthodoxy was their true faith and they were to go back if and when they found themselves in a place WHERE THEY WERE ONCE AGAIN FREE TO PRACTICE THEIR ORTHODOX FAITH. This is what they did along with thousands of others around the turn of the century.
That only 63 priests were there shows no one was forced to go. There was only one Orthodox bishop involved, Bishop Basil Tarasovic, who had proclaimed his own union in 1642. The Calvinist Prince Rakoczy refused to allow him to return to his see in Mukachevo and installed the Calvinizing priest John Jusko in his place. To regain his see and facilitate future union, he renounced his own personal union. He however nominated pro-union priest Peter Parthenius Petrovic as his successor before he died. He was elected at a gathering of 400 priests, receiving 370 votes, (quite a majority) and was ordained bishop by the sympathetic Orthodox Metropoltain of Alba Iulia. That however did not stop the Racoczys from appointing an Orthodox bishop, Joannicius Zejkan.
Which leads us to your oft cited claim the Greek Catholics were just Crypto-Orthodox waiting for a chance to be free. If that were true the Greek Catholics would have simply gone to the Orthodox off the boat in America, which we know did not happen.
We also know that in the early years, they didn't know that the Orthodox were in America. Once they found out, the ball started rolling.
Many just went over the border to Bukowina, where they made up the majority of the Orthodox by the end of the 19th century. Or across to the Russian Empire, where they played a central role in the recovery of the Kholm Land, now the heartland of the Polish Orthodox Church.