Bielsa is maybe the most serious coach in the world, and has some values he respects like no one does. He's absolutely professional, clear and honest.
So basically when he sees that directives of a club are not commited with the deal they had in terms of signings or any other thing, he'll leave.
But everywhere he went, he left a mark. He's done it with Newells Old boys, with Velez Sarsfield, with Argentina NT, he's like a God in Chile, and he played great football in Bilbao and Marseille aswell.
Thing is, he's a very demanding coach. And according to what every player says, he's the one no one loves being coached by, but that you end loving him and appreciating him aswell once you understand he took you to your best level. Because that's what he does, basically. This Leeds side looks like another thing compared to the previous season in terms of football and movements.
Bad thing is he's not a complete manager, he's gonna die with his football idea and is not pragmatic at all, which is something that costs him in terms of phisicallity every season. He assumes it, he knows it, but he still goes with his methods.