This is how I powerscale them. One dot indicates one drop in difficulty (so 1 dot = high diff, 2 dots = mid diff, 3 dots = low diff, no dots = extreme diff, commas = half a dot, for cases in which I think it may be, for example, somewhere between mid and high diff).
Kaido
.
.
.
King
,
Queen (somewhere between high and extreme diff for King)
.
Jack
.
.,
Who’s Who (a low to mid diff for Jack)
,
Sasaki
,
Black Maria
.
Ulti
,
Page One
For the BMPs, just sub out Kaido for BM, King for Kata, Queen for Smoothie, Jack for Cracker, WsW for Snack, Sasaki for Perospero, Maria for Compote, Daifuku for Ulti, and Oven for Page One. There may be a one comma deviation for some of these (for example, Smoothie is probably not as close to Kata and Queen is to King), but they’re essentially the same