Big gyms, from the bottom

I realised something so obvious it was hard finding it out.

High level gyms are defined by their bottom most defenders.

Of course it's best to have good defenders all through the gym, but when that can't be achieved it's best to have the highest quality defenders at the bottom of the gym. This is especially true for gyms at 25K prestige or above.

The reason is that if the pokemon at the bottom is very easy to beat, then an attacking player could simply flee after beating it for faster prestige decrease until that pokemon is kicked out.

For example a level 10 gym with four weak pokemon at the bottom is extremely easy to kick down to under 20K prestige.

Conversely the same gym with four top class defenders at the bottom would force the attacker to go through the number nine to seven defenders more than once.

This makes lapras an extremely valuable defender due to its comparatively low max cp in combination with being a grade A defender. The same goes for exxeggutor.