The Second London framework had already abandoned cumulative fleet limits in favor of restrictions on individual ships and guns. Fisher is unlikely to tolerate even those boundaries unless an escalator clause makes them easy to discard. In the counterfactual, evidence that another navy is considering a larger design could be enough to justify escalation. That would preserve the diplomatic appearance of limitation while allowing the Royal Navy to move rapidly from King George V compromises toward Lion-sized battleships and larger carriers.
Notable Point · 1:17:33-1:18:29
A weak escalator clause empties the treaty of restraint
If Fisher accepts a treaty at all, its ship and gun limits likely come with an escalator clause easy enough to trigger that designers can escape them quickly.