Routes wise youcould well be quite right, but as for FCA and MON basing an a/c, it is highly unlikely. Cosmos are not a big player in the NCL charter scene and Olympic primarily use XLA for their flying.
FJE will return to NCL as it is part of a 3 year contract with XLA, so maybe the same pattern as this year, though hopefully with aircraft from XLA's own fleet. Lets not forget that should all these tour operators expand like is being speculated there is a risk that the market could well be flooded at NCL.