I thought chuku plays as a number 8 1/2 or 10 (e.g., most advance in a midfield 3). Gabi can play more of an inverted wide attacker like mount. I don't believe chuku is effective in that role, while Gabi is and is also left footed. It gives you depth in that right attacking role. Right now you only have madueke that plays in that position? Gabi could be a decent backup to him or even starter
------ Caicedo (lavia/Casadei) - Enzo(Santos)
--Madueke (Gabi) - Nkunku(chuku) - Sterling(Mudryk)
---------------------------------Oshimen