Also, Re:Marshall and "Move 8 stuff won't be a consideration", other than 6.d3 or 4.Bc6:, I honestly don't really know where White would deviate.
1.e4 e5
2.Nf3 Nc6
3.Bb5
Starting position of the Ruy
3. .. a6
4. Ba4
If not the Exchange, White will play this
4. .. Nf6
5. 0-0
White has to do...