Thankfully we don't have team captains on the two leagues I play. One is a three person team, and one a two person team, both leagues you play your opponent individually with no coaching from teammates allowed.
Both leagues arevery well run and everyone gets along great most always.
The better players will always remind you first if it looks like you may be screwing up, the not so good players, will just let you screw up. Each their own I guess, I would personally never watch and let someone foul in league play with out saying something first.