The conclusion he reached was that someone must’ve tipped the Potter chit off to the possibility that Albus had manipulated her for the Greater Good then got in contact with the Directors of the DMLE and DoM to affect the changes in the castle. The only thing still available to him was the Chamber of Secrets which he resolved to enter no later than the end of the month. He needed to check to see if the basilisk was still present and what its condition was like.