I'm quite dubious of Fangraphs' evaluation of Yankees prospects; I think Longenhagen has his sources in the Yankees' org, and he's either unable to unskew the bias, or (somehow) doesn't realize it's there, because he's serially overrated Yankees' prospects his entire Fangraphs tenure. This isn't Scoops saying this as a Red Sox fan, this is Scoops saying this as a guy who has tracked prospects pretty closely for the last two decades. Guys like Florial, Cabello, Alcantara, Vargas, Roansy, Medina, etc., have all been rated well above where other evaluators have had them, and above where similar talents in other organizations have been rated. Take Luis Medina. They've had him as a 45 or 50 for three years. In that time, Medina has dealt with injury, averaged a walk rate around 14%, and never even pulled off a 2:1 K/BB. Compare him to Gerardo Carrilo. Medina has a couple inches on him, and is 8 months younger. Both guys can throw 100 mph, both have an elite curveball, except Carrillo also has a good slider and his changeup is better than Medina's. Carrillo has never walked 14% of batters; his 12% in High A was a career high, and just like Medina, Carrillo showed much better control in the second half with a 41/13 K/BB over his final 37.1 IP. Carrillo has also never been injured, and despite starting his career as a hilarious twig of a boy (he was listed at 5'10, 150 lbs), he's now estimated at around 185 lbs. Yet somehow despite having stuff as good as Medina's, except with a deeper repertoire, better results, less injuries, and pitching at a more advanced level...Carrillo is still rated a 40+. Which isn't even to say he should be rated a 45 or a 50, just that Medina absolutely should not be regarded as a 45 or 50. And it's that same kind of thing with all these guys. Like, Alex Vargas. Fine, if very far off middle infield prospect. Fangraphs throws a 50 FV on him, yet look at him versus say...Bryan Ramos of the White Sox. Ramos was younger, played at a higher level, and posted better numbers, all while getting consistently strong reviews from scouts...and Fangraphs drops a 40 on him. Again, not to say that Ramos is a 50, because he isn't...but Vargas is absolutely not a 50 either. Vargas is much more of a Leonardo Jimenez than he is Orelvis Martinez, to use examples from a team in the division. And don't even get me started on Alcantara, whose ranking last year was one of the worst Top 100 placements since Kevin Goldstein was still pumping them out.
TL; DR: Fangraphs serially overrates Yankees prospects.