I'm pretty sure he was trying to make a point to a stubborn board who were not prepared to improve the squad at the time. I was glad he had the bollocks to say something where other managers would have stayed being the yes man.
He publicly disrespected a Chelsea manager, a manager who won him a PL title in his first season. Scroll up and you can see some of the pictures. He also sulked and stropped on the pitch for many games, thinking he is bigger and better than what he is. Absolute clown.
I reckon Frank told Werner, Ziyech and Havertz that they along with Mount, Pulisic ect are the new era at Chelsea that can emulate Drogba, Lamps, Terry and co. That was probably what made them want to be here as much as anything else.