I agree with Fork, or more safely put I agree with my interpretation of Fork's posts.
I also agree that coincidence is a very misleading term, because coincidences aren't the product of haphazard. Coincidences just seem random because there's often very little chance of them happening when you look at it mathematically, yet they are the result of the path that this 'flow' is directing you on. (coincidences that happen to me always seem like incredibly intelligently planned or designed events)
Anyway, what Fork means(or what I think he means) goes something like this: Imagine all forms of existence being water molecules in a river(hence the 'flow'). Animals and plants are very good 'flow-ers', they do not try to anticipate twines of the river and do not try to end at a specific destination, instead they just see where the flow takes them. We humans try to anticipate everything coming our way, and are always busy with reaching a destination(or reaching a certain goal). Now imagine a water molecule in a river trying to reach a certain goal, chances are slim of him getting there, because he'd have to go against the flow. Similarly if we try to reach certain goals or manipulate the flow, this will most likely fail, which we perceive as being unlucky. Whereas someone going with the flow does not set a certain goal, hence no failure can occur.
I guess I went against the flow because I just read what I typed and it is not really clearly put... Anyway, it comes down to 'Zen' buddhism if I am not mistaken.
And...
Luck can only exist if you believe existence is a vast edifice of randomnity, which I personally don't.