In regard to what you said prior, that's your experience and I certainly wouldn't argue that. But you really want to correct my use of the term "rinse"? Really? Come on now. You are effectively rinsing the grain to get all the wort off them. From dictionary.com's 2nd and 3rd entry:
2. to douse or drench in clean water as a final stage in washing.
3. to remove (soap, dirt, etc.) by such a process (often followed by off ).
We are removing the wort. To get it out of the tun you are draining, obviously.
Rev.
I still see a difference. If you don't, no problem. Fly sparging adds water continuously to rinse the sugar out of the grain. Batch sparging adds the water all at once, then you stir to get the sugar in solution so you can drain it out. Sure you have drain the wort from fly sparging, too.