If you trade Lucy in instead of Tohu, and they both maintain their averages
Then after R13 Lucy will have scored an extra 15 points, and for about $100k less.
Obviously situation changes if either goes higher or lower than current average.
Its also possible to trade Tohu in this week and Lucy in closer to the bye which would probably be better at maximising points if trades/cash allows.
That's Brie-liant Milch!