I have numerous "crack and resub" high end 8's from 1965 (recently graded) with better centering than the Sievers, that didn't get the bump. Not even a half-point bump! Centering should be the EASIEST criterion to judge, yet the utter inconsistency coming out of Newport Beach forfeits any advantage their supporters try to claim.
#1 in 1959 Topps. Officially known as Assassin according to stanthemanfan 3/31/2014 and god of minor league basketball according to cammb.