No, they don't. There are rather a lot of important cmavo which are sumti.
mi, do, ko'a, ko'i, ma, & da all come to mind immediately.
Uhh... Yeah. But those are pro-sumti.
So the moral is that EVERY (sumti AND NOT pro-sumti)
INVOLVE selbri.
Okay now?
And 'ranjit' is a cmene, not a selbri.
I'm not so sure:
"Simply put, if you see a Lojban letter being used as a sumti, you take it as referring to the last sumti whose selbri
starts with that letter."
And referring back to a person with the letter the name of
that person begins with is a frequently used trick.
Although I might be wrong, naturally.
mi'e darves.