Fangraphs has him as a future 60 grade CF, there's nothing in his defense I've ever read to suggest he can't even be better than that with reps. A 70 grade D isn't out of the question with improved routes and instincts, but those only come with time and can't really be expected. 70 grade speed with great acceleration gives him some leeway there also.
I also expect he will be better than Pillar with the bat, which admittedly isn't saying much, but better with the bat with above average CF D for league min is fine in my books.