Not to mention that the spots for exp groups in elementals are rather limited (maybe 3 to 4 in Earth tops, 5 to 6 in Fire, basically noone does exp in air and few in water) due to very few 'safe' spots without regular wanderers.
With 6+ guilds in elementals and time on most servers this is a problem.
Also Slower/CC is basically a must.
If you have 'ubers' in PoV its rather likely though that they are alternates, applicants or members missing lots of flags.
Another possibility is that he/she is playing some irregular hours with not many people on.