Instead of just changing weight classes, fighters must manage their weight cutting process. Poor management could lead to poor performance, fainting, or fight cancellation, adding a high-stakes management element [1].
Are you aiming for more (like finances) or in-fight simulation details? I can refine these ideas further.
Based on the premise of creating new features for a simulation game titled " World of Mixed Martial Arts 5 " (which would follow the established WMMA series developed by Grey Dog Software ), here are some potential, advanced features that would deepen the simulation: