A day of gym work
Finally put all my 3xxx CP mons' butts sitting on Gyms, and a 2672 Blissey. it was tough since most gyms here dominated by Mystic team(same as I) Lv10 with a pile of Blisseys, took some time to find those lv7-9, and more time to prestige those pinky fat ladies... Feel good though after all, cant wait to see how long they will last
Answers
Exactly. What's going to last longer in a gym: a 100% maxed out Blissey with an ideal move set, or a 3174CP Gyarados with Twister that is placed above it? The system might not be ideal, but it is what it is.
Pokemon last as gym defenders because of their context (which gym, and how placed) more than anything else.
And location of the gym, early this year I travelled to nz, and visited a beach in Christchurch, it was a Lv4 gym, most low cp mons, so I just put my vaporeon in it, I didnt anticipant for a 2nd collection, but surprisingly, it waited for months for seeing it fainted back, probably the longest gym record I have since the very beginning.