Physical theories and tests of the weak cosmic censorship conjecture generally indicate that a Kerr black hole cannot evolve to become super-extremal (exceeding the maximum angular momentum limit relative to its mass).
The retrieved literature consistently supports the validity of the weak cosmic censorship conjecture, showing that extremal or near-extremal Kerr black holes cannot be driven past the extremal limit by incoming matter, fields, or particles when accounting for thermodynamic and backreaction constraints.