Whole French fleet falling in German hands...
Let me think...
France 01 January 1940:
IN SERVICE: 7 battleships, 1 fleet aircraft carrier, 1 seaplane tender, 7 heavy cruisers, 10 light cruisers, 1 training cruiser, 12 auxiliary cruisers, 58 destroyers, 13 torpedo boats, 77 submarines, 9 sloops, 15 auxiliary sloops, 32 fast anti-submarine ships (corvettes), 11 submarine chasers,
+
GERMANY 01 January 1940
N SERVICE: 2 battleships-predreadnoughts, 2 battlecruisers, 5 seaplane tenders, 3 catapult vessels, 4 heavy cruisers, 6 light cruisers, 3 auxiliary cruisers, 22 destroyers, 21 torpedo boats, 55 submarines, 7 corvettes, 4 patrol ships, 140 auxiliary patrol vessels, 30 auxiliary submarine chasers,
against:
UNITED KINGDOM 01 January 1940
IN SERVICE: 11 battleships, 3 battlecruisers, 3 monitors, 4 fleet aircraft carriers, 2 light aircraft carriers, 2 seaplane tenders, 13 heavy cruisers, 43 light cruisers, 1 cruiser-minelayer, 41 auxiliary cruisers, 18 destroyer leaders, 160 destroyers, 60 submarines, 34 sloops, 10 patrol ships (corvettes),
________
So French fleet would be addition to German fleet but trained sailors... You need not only French giving all their vessels intact , but also fighting on German side...
Furthemore 5 of 7 French battleships were modest, 25 000t displacement, 20 knots, WW1-era vessels.
Nice collection of French cruisers would be a game changer, not for Sealion but for raiding commercial raiding
Same goes for French submarines