This calculator assumes monster will get first strike, which is part of the maximum difficulty :) that chainsaw goblin isn't gonna be tough to take out, but it's gonna suck regardless!
So after two years of iterations and proba ly hundreds of logically extreme examples like the above, it's all accounted for already (even movement really - the user can pin movement into the S columns should they desire, to add an edge, or a fudge number).
No worries either though, liking the formulas isn't required and I highly encourage folks to come up with their own -- make it better, or make something entirely different!
Best of luck!