If you need a 4* Rank 5 as another attacker in Questing or AQ then perhaps rank up your 4* Wasp. She hits medium-hard but she's too much glass - too little cannon to be useful overall. If you need to be careful with your T4b and Science T4C then wait for a 4* Void or Captain America IW or Electro who will be excellent 4* Rank 5s for the future when you do Variant and other special events! Good luck!