It might be useable for speed scaling, if you go with gillian cero=lightspeed and first episodes ichigo reacted to and blocked a cero from a Gillian, scale this to relativistic reaction speed, then go with 20% base byakuya blitzing a far faster and stronger version of this ichigo and then go with multipliers and so on. I did such a calc once(it was wrong tho) and obtained absurd values like around 2 billions of time sol for shinigami aizen. One could also use senbonzakura kageyoshi being faster than shikai ichigo who is relateable to shikai byakuya, who is superior to bankai renji, who(and now we use multipliers) is superior to the renji who went extreme diff with shikai ichigo, having 100million petals and ichigo deflecting all those 100million attacks moving towards him at double the speed that was greater than that of shikai ichigo. And then, just spam multipliers.
The only problem is gin's "mach 500" statement, but even that can be argued against to some degree.