Just thinking out loud here..
with most regular houseplants, its generally a BAD idea to pot a plant in a pot that is far too large for it..
mainly becase the pot will hold too much water and could rot/damage the roots.
so you want to pot your houseplants in pots that are not too small, not too large, but just right.
but with CPs, does it really matter if a pot is 'too big"?
being "too wet" isnt really an issue!
suppose you got a nice mature Sarracenia,
would there be any positive or negative aspects to putting it in a huge gallon-size pot of spagnum moss??
as opposed to a much smaller 5" pot?
the only difference I can think of is that with the large gallon pot, you would need to keep a much higher water table in your "tray" when watering with the tray method..
you would probably need standing water at least half-way up the side of the pot..
which means you have a huge amount of saturated moss at the bottom of the pot..
and maybe 6" of moss above the water level.
so the surface could be much drier, and the bottom much wetter, than a regular small pot.
you are basically making a mini-bog with only plant in it!
as opposed to the "regular" small pot and tray method, where you have maybe one inch of water in the tray and only 2 or 3 inches of moss above the water level.