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