Yes exactly. And that's why I don't jump to the assumption that Zelenskyy himself is corrupt or he is covering for the corruption of others.
A dude that would tolerate corruption doesn't say 'I need ammunition not a ride'. He could have bailed at any point, still could. But he shows no signs of losing resolve.
If Zelenskyy is trying to keep inner circle corruption private to avoid public spectacle, I suspect that whoever is found guilty will probably end up wishing they were arrested publicly rather than dealing with the security service.