This is as it should be, since the inclusion and ordering of the firms should be based upon the characteristics of the banks as they have evolved closer to the effective date. Some banks have changed their profiles materially in the past couple of years, and the prospect of capital surcharges may be an incentive for others to do so as well.
In this regard, I should also note that the bucket allocation of each G-SIB will be recomputed in each year after 2016. The use of more up-to-date data means that banks will not know for some time exactly which buckets they will occupy when the surcharge first phases in.