Hmmmm, yes DC, that's a very interesting passage. I haven't read the book in a while either but every so often, I glance through it. I think its time for me to have another reading.

I would say that, just from that passage alone, Fredo could not have known about Roth and Ola and their true intentions. Although, we all know that the movies don't always go completely by the book (i.e. Vincent Mancini... )