That's where I'm uneasy about Cassius maintaining the anticipations are wrong or can be wrong, if I'm reading him correctly.
So please help me be as absolutely clear on this as possible, and let's beat the point home like a drum:
No data (sensation?) from a canonical faculty is anything other than "reported honestly" so that data is always "true to us at that moment" in the sense that it is reported truly ("honestly," "without injection of opinion.")
But at the same time, no "data" / "sensation" from a canonical faculty is ever, in itself, a "concept" or an "understanding" -- it is always simply a "feeling" or a "bit of sensory data" that must be built up in the mind into words and concepts.
This is the trademark attribute of what it means to be a canonical faculty - they operate "automatically" without injection of "opinion" ("concepts") at any time.
No "concept" is ever "absolutely true" because concepts are constructions of the human mind and are not given us by gods or through ideal Platonic forms.
Therefore in human terms, the only test of "truth" is really "true to us" which is what we build up from the set of three canonical faculties.
Now another absolutely vital concept that we haven't stated so far in this conversation is that these attributes of the canonical faculties (that they are only true to the extent we reliably build them up from our canonical faculties) is not a defect or a limitation of something to go hide in our cave and cry about. This attribute that these are the only things that are reported to us without opinion mean that they are our most prized and vital possessions which we MUST use and we MUST rely on to form our own judgments about how to live and everything else that is important in life.
The Platonists and Religionists have backed us into the corner of thinking that only if a concept is absolutely true for all people, all times, all places is it worth anything. That is absolute RUBBISH and BS and needs to be treated as such. We have to seize the moral high ground and assert not only that we are firm in going with the conclusions that we draw from our canonical faculties, but we absolutely reject and dismiss (probably even the Epicurean "spit on") the assertions of absolutely truth -- because they are childish fantasies and deserve to be treated as such.