Hmm, Interesting! Those edits by Marivancauteren definitely look like WLM uploads, but are made with the proper template for the whole category here
http://commons.wikimedia.org/wiki/Category:Uilenspiegelmonument_%28Damme%29
Looks like a Wiki Commons savvy user who doesn't care about the contest. Reflecting on my own activities, I recall making some uploads that I consciously did not upload with the WLM uploader, because it was museum content that I felt was unrelated to the building's history (as opposed to museum content that I felt WAS related to a building's history).

WSC's points are a bit disconcerting - I certainly hope the spike in non-WLM uploads were just this sort of "related-but-not-WLM" or "Heritage-but-not-interested-in-contest" and not "frustrated-WLM-attempts".
As for uploads from non-participating countries, I agree there could be possible future local organizers in that group, if they are not too frustrated by their upload attempts this year.
Jane

2012/10/8 Erik Zachte <ezachte@wikimedia.org>
Here [1] is a list of all Commons users who only edited namespace 6 in Sep 2012,
who are not listed on the (provisional) list of WLM uploaders [2] or the slightly more permissive [3].
Links lead to list of contributions per user.

[1] http://tinyurl.com/8dacm5f
[2] http://tinyurl.com/949bc8x
[3] http://tinyurl.com/9kzft4m

I checked 36 top uploaders:

Monument related but not on [2] [3]:

1032 edits for Sreejithk2000_AWB http://tinyurl.com/8ehx77x  (many in category 'WLM 2012 India unreviewed‎' )
98 edits for Instandhouder http://tinyurl.com/97ze5p7 (category 'Rijksmonumenten')
88 edits for Marivancauteren http://tinyurl.com/8rl46b8 (category 'onroerend erfgoed with known id's / lots of 'monument' in file desc)
86 edits for Cpiro http://tinyurl.com/8phbs3p (category 'Monumento Histórico')

Several more in top 30 uploaded buildings, which could be related but also might not be, e.g.

98 edits for Maharajsaran http://tinyurl.com/9qfqwav (not categorized as monument, and perhaps not meant for WLM)
85 edits for MartinSilk http://tinyurl.com/9rjuamx (might be cemetery rather than WLM, although quite a few buildings)
88 for Andries Van den abeele http://tinyurl.com/95f7hck (streets rather than buildings)

Erik Zachte