The timing and circumstances of ʿAlī’s pledge are discussed differently in historical reports. One strand mentions an initial delay followed by allegiance. A further argument would be required to infer that every delay entails complete rejection of the legitimacy of caliphal office.
Temporary hesitation, disagreement in consultation and principled denial of an office are separate concepts. A definite conclusion should not be drawn by isolating one report from the wider evidentiary record. The subject warrants careful historical analysis and respect for the persons involved.