Gellert nodded, he could feel an idea -- a solution -- stirring in the dark recesses of his mind. He'd have to wait until it was ready to show itself, then he could assess whether it was worth mentioning to Albus.
"Well, if I only have a year left with this knees," he jumped in place a couple of times, "then I'm going to have some fun with them."
Grindelwald offered his own greetings to the ghosts and portraits, some seemed a little sheepish, but all were relieved to see Albus.
"You've answered your own question, Albus," Gellert knew he was stating the obvious. "If you aren't here for the students, then what will prevent you from seizing the power? When power calls you or I, that is when we are most vulnerable and corruptible. As it was with the Hallows, so it is with Hogwarts. The game has changed, and so to must the pieces."
Grindelwald walked into the dormitory, eying the low ceilings and appreciating the green glow. "The craftmsanship is extraordinary," he ran a finger along a carved chair, admiring it.
"Do you regret letting him go back in November at Chateau Riddle?" Gellert asked the question that had been lingering in his mind since he arrived in the Great Hall.