Well Plan B (if you mean my point b.) is not about “present”. It’s about signup and confirmation.
With version b. you can get the following statistics:
In the last 10 raid player X was signed up 80% and was confirmed 75%, were signed with Late status 10%, and signed with Non attending status 5% (means in 5% of the raids he/she didn’t signed up)
Let me clarify one thing:
In my point of view PRESENT is not something that RaidPlanner knows. RaidPlanner knows about signup, invitation, and confirmation.
It can happen that a character was signed, confirmed but wasn’t there (did not PRESENT)