Implied sumti ordering

["Mr Ekted" <mr_ekted@hotmail.com>]

x1 citka x2 (eats)

If I say "fe le rectu cu citka mi" is this malglico? "mi" is technically the third sumti right? But in this case, there are only two sumti defined by the selbri, so does "mi" automatically become x1?

I realize there are other ways to say this like:

mi citka le rectu
fe le rectu cu citka fa mi
le rectu se citka mi

But I'm trying to understand the extent of the ordering rules. If I am correct, what happens with a 3 sumti selbri if I do the same thing?

fe A cu selbri B

In this case B is x3 by default?