You know, it has occurred to me -Shallan's drawings are not really creative (at least not the Memory-based ones). They are more like photographs, representing the moment exactly and without any imagination whatsoever (although Shallan can draw normally, as well). SO they may be actually part of the "Truth" ideal
My thesis is - there is little relation between described attributes and the stuff that attracts spren, and the relationship is backwards, that is, KR were before, and the attributes were just derived to describe them, so the order does not matter. So, Syl is Spren of honor, oaths and nobility, but honor is usually expressed in protecting the weak and not abusing ones power, and people are more likely to follow a noble person. In Shallan's case spren crave personal secrets, so one must be honest (to them) and creative in using their secrets, or maybe gets Memory as a side ability, so can create nice drawings, etc... Then, Shallan gets a spren, since she has a very good, strong secret that no one knows, while Tar..nation.. guy have a hospital-full of acolytes that share his secrets, so spren's interest is much weaker.