Hi Terry, yes, guilty, I wrote that Wikipedia section on overhead, not the whole thing. Some of that later diagram in the Wikipedia page is wrong on the lower rhs and your diagram is correct.
Concerning the overhead of PPP itself, these articles are rather confusing as they describe the maximum framing overhead of PPP as it might be used in dialup. Reading into the small print qualifiers, almost everything can be and always is negotiated out of existence in practice. See the references I gave in that Wikipedia article which do talk about the actual practical amount of PPP’s own overhead.
