i had a few theories as to why valerie and luke appear to be string-less. 1st was valerie's theory, with their soulmates just being super far away, but that was kind of a... stretch. 2nd theory was that they just don't have strings, in which case they're free to date anybody with a broken string or no string... such as aaron or eachother. little lonely but not too bad. 3rd theory, and the one i personally prefer, is that luke and val are soulmates, thus sharing the same string, thus unable to see eachothers' strings because they can't see their own, as seems to be the case with all seers.