Since I work in GR, let me clarify some things:
1.) The ACE walkback IS everyday. Some days there aren't any ACErs to walkback or they dislike the ride chosen. For example: I got to do the walkback today for GR but The Beast was going to be opening late due to weather, so when I told the 4 members waiting that we would be going to Delrium instead they decided not to go. Most days it's a GR manager, who will have a nametag on that says "Guest Relations" and "Area Manager" at the bottom. Sometimes us lowly associates (usually returners) get to do it if the manager is too busy.
2.) The walkback is usually around 9:45 or so. Most of the time The Beast won't open until 5 or 10 minutes prior to regular opening, so there's no point in hurrying back there. As long as you're at the stone at 9:30 and just wait til 10 then you didn't miss it. And yeah, if you have doubts then check with the Front Gate.
3.) I do not usually card the ACErs. The managers do and are required to, but if it's 4 people then I don't usually bother. I just walk over to the stone and ask "Anyone an ACEr?" Whoever replies correctly gets to go. I've had kids go back that aren't ACE members but they can't be left behind, etc. So I'd say you're riskin it if you bring your brother/sister/cousin/whatever since you SHOULD have a card to ride.
4.) We always, ALWAYS, try to go to The Beast. If for some reason that ride is not going to open on time (like today) then we will either pick SoB or Delirium as a substitute. We know that The Beast is our cash cow and we know that the ACErs usually want to ride that one most.
I hope this clears some things up...
Andy