I'd say that an anticipation must be involved for every word we use -- we would have no idea what any particular word indicated unless we have some general stereotype that we access before we start thinking or speaking about any object or relationship.
I agree with that so long as the emphasis stays on the word "involved" - because I suspect a lot of people will read what Diogenes Laertius wrote and conclude that anticipations ARE concepts. I think we all or mostly all agree here that anticipations are *not* in themselves concepts, but something that is PRE-concept.
it's awfully tempting to try to boil things down to "I see 5 men. I form a concept of a man. The next time i see a man I match what I see to the concept and conclude 'That is a man.'" But I think that that would be an error to conclude that is the complete picture.
The complete picture contains something before "I see 5 men." Because from before you ever saw your first man, you had some kind of pattern-assembly faculty going on that told you to associate the head and body and arms and leg into a single "thing." I am thinking that labeling that "thing" as a "man" is something your mind does in forming an opinion AFTER the prolepsis has presented to your mind the perception that the mind needed to organize this particular relationship into something to name and then remember.