How much an employee looses and how much Bank saves by Spl.Allowance concept?

How much an employee looses and how much Bank saves by Spl.Allowance concept?
(i.e. spl.allowance is given separately instead of adding to Basic pay itself )

A Special Assistant retiring with Max. B.P+Spl.Pay+PQP+FPP will be as follows with Spl.allow. and with Spl.allow. added to Basic Pay:

Gratuity: 20,00,000-18,44,483
Diff. (-)Rs.1,55,517

Commutation: 16,59,459-14,47,642
Diff. (-)Rs.2,11,817

Pension after commutation: 38259-33375
Diff. (-)Rs.4884 per month
If we assume life expendency as low as 70 years it will be 4884×120=Rs.586000
(Excluding D.A.increase every six months)

For officers loss will be more as their B.P. is much higher.

For employees under NPS , contribution by Bank will be lower by 16.4% every month for 35 years of service.
As NPS contribution is based on B.P+D.A there will be no increase in NPS contribution even though D.A increases, on Spl.Allow. portion.
Future increments also already reduced by 16.4%.
Therefore Contribution on future increments will also be reduced by 16.4%.
If the concept is continued this percentage will go on increasing by every 5 years due to wage revision.
In this way Accumulation of NPS corpus will be affected at the time of retirement.

This concept is not a Govt.Policy like introduction of NPS.
This concept is accepted in Banking sector only.