No, I don't think the Avs are even stupid enough to leave Z unprotected. The default option is to just go 4/4.
They're not, they can't leave the main piece of a major trade unprotected. It would be the end of Sakic and he knows that.
Not to mention it would be the complete opposite of what he has been preaching to the fans of faster and younger, it would be pretty hard to sell that catchphrase if he protected Beauchemin and left Zadorov out there to be plucked.