You saying he has a lack of arm strength does not make it true. Nobody is grading his arm as below average, but you. The article you posted by Fangraphs never mentioned arm strength, perhaps you think by Logenhagen saying that he's taking extra steps before his throw means lack of arm, but it doesn't. At the very end, Logenhagen said he'd be fine, just RIGHT NOW, the bat is above the defense, it's not uncommon that one tool grades out earlier than the other with a 19-year-old. You keep saying his arm is bad, though.
The eye test, ah, makes more sense now.