Replacing an injured battlecruiser commander

Why would Sturdee be chosen over other officers to replace Beatty?

He combined the required rank, battlecruiser experience, Grand Fleet position, and sufficient political weight for the command.

An independent battlecruiser force was too important to leave under a junior rear admiral. Beatty's severe injuries would make him unfit for sea command for far longer than an initially hoped-for six months, so a real replacement mechanism would have to operate. Sturdee was already a vice admiral, understood battlecruiser operations, and could be moved from within the Grand Fleet. Churchill had left the Admiralty before the counterfactual accident, while First Lord Arthur Balfour was more likely to leave the appointment to naval authorities. Sturdee's own political standing also made him robust enough to take a command exposed to public and institutional pressure.