I think the Conte rumors make a whole lot more sense.
There's a lot less motivation to come here for both Simeone and Allegri. Both are managing top clubs that will be in the CL next season and competing for the local leagues. This will not be the case at Chelsea. Make no mistake, at the moment it would be a step backwards for both of them.
It would take an immense desire for a new challenge or, more likely, a decision based almost solely on money and wages, to bring either of them here.