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It’s not a straightforward answer.
Imagine we have a 77W with F, J, Y+ and Y.
F has 3 seats open, no J seats open, 3 Y pax waiting for SWUs to clear, 3 standby pax on employee benefits (who can fly in any cabin with empty space).
No J-> F SWUs.
SWUs don’t clear Y->F in four class and AA doesn’t have to roll J pax to F to clear those SWUs so those employees get first class seats.
If there were only 2 employees one F seat flies empty.
You’re asking for certainty in something where there are a ton of shades of gray (if Y was oversold you could roll J pax to F, etc) and the gate agent is under pressure to get flights out on time.
You are unlikely to find it.
Most of the time the answer is “it depends” for things like upgrades.