Template:M summ 2002 ISDA 6(d)
This clause has nothing to do with grace periods and everything to do with working out the termination value of Transactions for which you’ve just designated an Early Termination Date - in the 1992 ISDA using Loss and Market Quotation, and all that Second Method malarkey (in the 2002 ISDA thje much neater and tidier Close-out Amount concept. This is good fat tail paranoia material, so expect to see it modified.
A popular parlour game among those pedants who still insist on using the 1992 ISDA[1] is to laboriously upgrade every inconsistent provision in the 1992 ISDA to the 2002 ISDA standard except the one provision of the 1992 ISDA they always liked — if the pedant is in question is from the Treasury department, that will be the longer grace period in the Failure to Pay; if she is from Credit, it absolutely won’t be.
You might well ask why anyone would be so bloody-minded, but then you might well ask why anybody watches films from the Fast and Furious franchise. Because they can.
Or, possibly, to preserve the slightly more generous grace periods for Failure to Pay[2] and Bankruptcy[3] (in which case, you’d retrofit longer grace periods into the new version, wouldn’t you? But no).