Of course a lot of people answered "some" to "very much"...
but I think that if yonkyo really RELIED on pain then ikkyo could never work. I mean there probably isn't anyone who would say that the pain doesn't HELP.. but that is not to say yonkyo relies on it.
Really, how can you say yonkyo relies on the pressure point pain when ikkyo actually works without pain? They are only slight variations on each other. Even without hitting the pain spot, yonkyo is sometimes easier than ikkyo--that's why I voted "not at all."