Remember Cranflield's work is evac focused and reliant largely on physical tests which are at best surreal and not representative of real life ops on an a/c.
I remember seeing some evac tests on a doco - all nice and orderly until they offered 10 quid to the first 20 people out - jammed exits all around.
The Hudson was 1 to 50 - 3 FAs and 150 pax - they got them all out.
Another major in recent years was Air France in Toronto. 10 FAs and 297 pax they got them all out while the thing was burning including 2 babies, 3 wheelies and a blind pax - but would they have got them all out in that case with 1 to 50?