I don't think Blade said it correctly. You are completely correct that if someone was going to lose via storyline purposes, they would need to be notified first and then work out with creative about how to do the finish.
However, if the team/an opponent lost by votes alone, then sometimes the way the storyline has played out deduces that a certain member of that team/match would take the fall instead of the weakest RP.
There are also other factors such as protecting the champion, flow of the match, requesting to be pinned, etc. that contribute to who takes the fall.
Most people associate taking the fall means they had the weakest RP but in some cases, it doesn't. If there is a problem, creative should inform whoever is inquiring (as long as it is appropriate) that the loss was done for reasons other than having the weakest RP.
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That should cover everything without any confusion.