Its been a while, so forgive me if some of this is not up to speed, but I think it is. What troubled me was the word VEST, and it honestly took me about a month to actuall grasp the RAP
Vest DOES NOT mean POSSESSION, it generally just means ascertainable person. Will a person be known, or will a person not be known, by the day of 21 years?
e.g. Bud Selig to Mark McGuire until the baseball homerun record is broken. If Broken, to Bonds, if not, then to Sammy Sosa.
Will the homerun record be broken (the vesting event), or not be broken in 21 years? No, b/c it can be broken before or after the 21 years, violation!