There were indeed two (If not more, which is a good possibility) different runs of the NSs with Kimmitt’s name on them. You are going to be hard pressed to find a Northstar that will crack anymore, because all of the ones that were going to crack already have. They corrected the problem, and if it occured again it would be isolated to a single yoyo flaw.
Plus I think YYF will replace any faulty yoyo. They replaced my Northstat that had spacer issues(I got it used so I cant blame YYF)