CARD: Storing sequence numbers in ARs' CAR table?

"...Should the sequence number be stored in CAR table to enforce ordering
of CARD replies ?"

In my opinion, an AR needs to remember the sequence number
of a request only until the associated reply can be sent.
What could be the advantage of maintaining the sequence
number in an AR's CAR table for a longer time? Info flow
is from AR->MN, so it's the MN's responsibility to choose
sequence numbers appropriately for correlating replies
with requests and possibly to counteract replay attacks.
In case there is a positive offset in sequence numbers between
two consecutive Requests, this should not matter, or?

marco