I like Chanos, but this seems like a terrible stock to short.
A smart management team can absolutely kill you with their options when you generate so much cash:
buybacks, debt reduction, divestures, cost cutting, etc.
And you're shorting the survivor in an oligopoly business.
Reminds of when Dave Einhorn presented and shorted Moody's in 2010.
Chanos and Einhorn are really bright and convincing, but they can be too smart for their own good.
The only thing DVA can't control is the reimbursement rate.