You’ll need a dd G1 or G2 if you want to attack G3.
Normandy G1 is not part of my Sealion plan, especially when you won’t be able to swing the 10 tt cause you’ll need to buy a dd.
Think about Scotland landings on G2 and G3. To do this safely, occasionally additional AC or dd purchases are necessary.
Don’t stake everything on a G3 landing with less than 90% odds. You can land Scotland and take it G4.