What.

SEI = Ignoring Se = Base Si = aware of power structures and power plays, but preferring to not take part in them.
SEI = Demonstrative Fi = Creative Fe = aware of how actions impact relationships, and capable of forming right/wrong moral judgements of behaviour, but focuses on maintaining a relaxed, harmonious atmosphere that keeps people on good terms. Also inclined to discard judgements formed--why Fi PoLRs come across to Fi Demonstratives as "loveable assholes".

See how this is just a restatement of the SEI's ego functions? The Mediator can equally refer to either SiFe Ego or FiSe Id.

EDIT

And what the hell does "suitability" even mean?