I'm not sure this is ideal. We play much better when we have congestion and momentum - this always shows and why we finish well. It's fine balance between resting and keeping momentum going.
He can rest those who need it across the two games that are now essentially friendlies - but needs to keep them warm, engaged etc..
I feel like it would make sense to play half the starting XI on Wednesday and half on Sunday.
That way everyone has played a full game either 6 or 9 days before the cup final.
Rest KdB, Bernardo, Grealish, Stones, Walker against Brighton.
Rest Haaland, Dias, Akanji, Gundogan, Rodri on Sunday.
Brighton XI - Ederson, Rico, Dias, Laporte, Akanji, Rodri, Foden, Gundogan, Palmer, Haaland, Mahrez.
Brentford XI - Ortega, Walker, Stones, Laporte, Aké, Phillips, KDB, Bernardo, Foden or Mahrez Grealish, Alvarez.