What does the Chief find fascinating about McMurphy in chapter 17?

The patients love knowing that McMurphy "got the nurse's goat the way he said he would." McMurphy becomes more bold and aggressive. He asks Nurse Ratched for the measurements of her breasts, which she tries so hard to conceal. But Nurse Ratched does not lose control again. Bromden thinks that McMurphy may be strong enough to resist the Combine, suggesting at least a stalemate between hero and villain.