JBJ hasn't had enough time to show/prove anything yet. Prior to this year, he had roughly the same amount of MiLB ABs as Griffey Jr had, Jr just did it younger. Give JBJ a break here, he's only had 100 MLB PAs in limited action to start his career. How about we let him play a few months regularly before we start making any comparisons to anybody?
And why are you trying to compare him to Griffey? Of course Griffey was better, he was a generational talent, but he's already falling victim to people inflating his stats. Yes, he crushed A pitching in '87 and '88 before getting promoted to AA in late '88. While he wasn't as productive there, he still hit AA pitching to the tune of an .845 OPS in 17 games. He didn't come up to the bigs and mash either. He started somewhat slow, with a .650 OPS over the first few weeks, had a nice summer, and then finished the year with a .600 OPS over the last couple of months.