I can't comment about other books I'm afraid. We don't use set routines like that, we respond to our Lo's and the signs they show us and adapt a routine that fits well for them and also with your family life. I really don't know much about that other authors methods
For some going through the 2-1, yes we can limit the morning nap, or afternoon one (whichever suits them best) but that's because the A times are so high that it gets impossible to fit it into one day. I don't think you're quite there yet however. A times need to be nearing the 4hrs + mark.
It some ways yes, bubbas can use the first nap as an extension of their night sleep but that's because the first A is too short and needs extending. It's their way of naturally extending their own A time by waking early. Saying that though you were getting 11hrs ONS weren't you? So technically not an EW so I think it's really just a case of shifting the whole day for you and actually extending the A times to get rid of that CN at the end of the day for you now. At 8mo that's got to be on it's way out, even for a HSN LO.
How was the night sleep before the 5am wu? What time was BT? Xx