Theres one mission in A rank i dont think the devs even bothered to test.
Large triangle spawn of points, small time limit, get a large number of points..... only chains count!
Going in with full GP, food buff, Using hi-cordial, sprint on AND using Solid reason with proc is not enough to get more than silver. Its physically impossible to do!
Im in full meta penta with over 900GP and after 8 times cant get past Silver, even on the run when Solid Reason procced every single time was only a silver.
The devs clearly aren't testing what their making.

And dont get me started on downtime between missions to recover GP.....