Here's a thought I think we should all consider about LMFUs...
It does seem that multiple people share the same LMFU (whether prior to 1/15 or post) and that many have seen movement in these dates in tandem. So I'm thinking that this observation makes it unlikely that the LMFU is related to the match. With all of us having interviewed at different schools, with our own unique preferences and chances of getting in, it's very unlikely that so many people would share the same LMFU if this were indicative of the TMDSAS system "attempting to match" candidates to particular schools or to place them on alternate lists, etc. Perhaps there is some other means by which we've all been grouped into catagories...age, time our applications were initially processed, out-of-state/in state, reapplicant status, and perhaps even gpa or mcat scores...
BUT even if these last two possibilities are the case, such a grouping still does not imply a failure to match. For example...and I'm making this scenario up... If a large number of candidates with lower scores were to share an LMFU prior to to the preferences deadline at 11:59pm on 1/15, there's NO way TMDSAS could run the match at that time to determine a failure to match. Such a grouping such as gpa/mcat stats could simply be a way to catagorize people. The logic behind it may well in fact be that people with higher stats are more likely to get in, but as we all know there are MANY MANY exceptions to this rule. How do I know? Look at the TX school averages... Those averages are just that... a mean of both higher and lower stats.
And remember once again, last year people matched with Last Action Updates dates prior to and post 1/15. This points to the fact that an LMFU prior or post 1/15 is very likely irrelevant to the match.
Does this long and drawn out theory of the LMFU's insignificance seem plausible to anyone else?