What if Beatty replaced Jellicoe before Jutland, and who would then command the battlecruisers?
Short answerThe seniority problem is substantial, but Hood is a plausible replacement whose gunnery standards could make Jutland an overwhelming British success.
NotesBeatty lacked the seniority to move directly into Jellicoe's post without several other flag officers also being displaced. If that handwave places Beatty over the Grand Fleet, Horace Hood is a plausible battlecruiser commander. Hood's intense focus on gunnery training could lead the British battlecruisers to damage Hipper before the historical run to the south, while a Hood-Sturdee or Hood-Jellicoe combination points toward a much more decisive British victory.