There is a group 2 indicator (only) and a group 4 indicator (cannot) in that sentence. So you can use either one, but generally it's easier to use group 4 indicators as negations and use the other one as the logical indicator.
@"Accounts Playable" Yes. I would treat "it is a given" and "for such" as premise indicators. "Given" would introduce evidence (premise) for a conclusion. Treat "for such" the same as you would "for".