Can he ? I mean know one here has any idea how his specific clauses work - mayby he takes up the options for the 3 yrs, mayby he will take up 1 at a time, mayby it has specifics about timings, who knows and honestly at this stage who cares.But he can opt out of an upcoming season. So if he stays in 27, he can still opt out of 28 if he wants.
Also look how well the Stef clauses played out for us - replaced him a year early and spent his money on May and Hunt so upgraded our squad