It seems my previous statement is slowly becoming correct
As I said before, the crooks who supported Imamoglu were the ones who betrayed him and sold him to Erdogan in return for greater power
Erdogan isnt an idiot or he would have died long ago. Whether you like him or not, we must admit that he played this game for more than 20 years and is already a master at it. He knows that there will be rising public unrest if he ever arrested Imamoglu without reason and yet he did so anyways and this may imply that Erdogan has some serious evidence regarding Imamoglu along with some of his cronies that even Imamoglu himself cant escape from
This also explains why Imamoglu initiated this early presidential candidate fiasco, 4 years before the election even begins. He probably got a tip that some1 from his circle betrayed him and so he turned the story into a public case in order to pressure Erdogan to leave him alone
Erdogan is admitting that it was the CHP that sold data about Imamoglu to the police

"They are also aware that most of the information and documents (investigation into corruption and terrorism against the Istanbul Metropolitan Municipality) were transferred to the judiciary by their own party members"