Note Germany can still Sea Lion if they do a 10 Inf purchase on G1.
G3 Sea Lion just consists of 8 TT (1 Starting + 7 purchased + 1 CV purchased).
If UK1 doesn’t put Inf out on London, you can still Sea Lion effectively. Particularly with a very strong SBR on G2. I’ve done it.
So spending 12 IPC on a Minor in Egypt and putting 10-12 IPC in S.Africa sets you up for it.
Even with G2 ending with 8 TT, thats 8 Inf and some combination of Arm/Art that can land in Archangel or Nov on G3 if the UK went defensive.
Combined with an attack on G3 from Poland on the Baltics (Supported with Arm from the French Invasion) you can have solid stacks on G3 that end up in the Baltics and Arch, effectively surrounding Leningrad for G4. Just so happens if Leningrad falls to Germany on G4, the Japs can land their entire air Force on Leningrad on J4 (need AB at Suiy). Thats not a pretty sight for the Russians.