Nothing shocking here, except the pidgey. But sometimes players just want to take a gym down and place a weak one as a prank.
Actually the best gyms after 4-8 hours are those with initial member CP of 600-1400 because that gym will still have over 2/3 motivation of all inhabitants, usually full motivation since only one berry is needed. That will require 18 fights of 20-40 seconds to bring down instead of 6 fights of 15 seconds.