Hogwarts: What are the four great masters doing?

After traveling for seven years with four teachers in the magical world a thousand years ago.
Ryan found himself back in 1991, back to the orphanage he was familiar with.
After three days.
He saw a white owl flying towards him with a Hogwarts admission letter in its beak.
"The monster from Bournemouth has landed in Diagon Alley!"
"The ridiculously pathetic Mudblood crossed the Black Lake amidst the cheers of the Giant Squid!"
"The unspeakable dark nemesis has arrived at the Great Hall!"
"The descendant of the great Big Four has returned to his loyal Hogwarts!"