1. Juventus Believe in Him - this is apparent for two reasons. First is the fact that Juventus is willing to pay 3 - 5 mill for his loan. Juve paying to bring in a loan player is a big tell in their confidence in him.
Also in the Serie A, you can only sign max 2 players a window who don't have an EU passport. As far as I know, McKennie only has an American passport therefore one of those 2 valuable non-EU spots is being taken by him. Again another sign of the confidence Juve have in him
The deal for him with the option to HAVE to buy him if he plays 60% or more of the games is almost a guaranteed one and shows this is a permanent move just in disguise possibly just for accounting and booking reasons Juve are splitting it up in these hard times with Corona
2. No One at Juve has McKennie's skillset - I've heard a lot of people talk about how he won't play because they have too many good midfielders. That argument would be valid if they had a midfielder whose specialty is winning the ball back and being a physical presence in the mid
McKennie is a direct replacement to Matuidi who has played the most games out of any other Juve player in the past 3 years. Which a good sign because it shows how important that defensive mid role is to Juve. The great thing for McKennie is that no one at Juve does what he does
Bentancur, Arthur and Ramsey are not ball winners, Rabiot could possibly be one however that is not his natural position and he is more offensive-minded. Khedira is being released and Pjanic is also set to leave this window, even if they didn't, they don't have Mckennie skillset
McKennie out of this entire midfield could easily be argued to be the best ball-winning midfielder on the team right now. That is not a hot take. His defensive numbers at Shalke are significantly better than every single one of these midfielders that Juve has right now.
While Pirlo is a big unknown in style and personnel he wants from his team, chances are he is going to need a ball-winning specialist in whatever system he plays. McKennie is the best guy for the job. He also has the ability to push the ball upfield if Pirlo needs him to
3. McKennie's Teammates - McKennie's biggest weakness is his decision making, soccer IQ and not the sharpest and cleanest of technical ability whether its dribbling or passing. All weaknesses that happen to be the strength of his fellow midfield teammates.
Arthur and Bentancur, the most likely starters who will play alongside McKennie happen to be very technical and smart players but don't really do all the dirty work and ball-winning that McKennie provides. McKennie takes care of their weaknesses and they take care of his
But not only can he make up for their weaknesses but learn the technical side of the game through them by constantly practicing and playing with them, helping McKennie further develop a weaker side of his game. Speaking of developing
4. Pirlo - While we don't know much about the Pirlo the coach we know about the player. He played in very tactical sides and the Serie A, in general, is more tactical than the Bundesliga. Pirlo can teach McKennie the tactical intricacies of the game and specifically the midfield
Not only does McKennie have a lot to learn from Pirlo and playing the Serie A but also it seems that Pirlo has said before that he wants to play with 3 midfielders, play very attacking football and win the ball back immediately when they lose it which is great news for McKennie.
This is the perfect system for McKennie to slot into.He can play that 3rd midfielder behind 2 more attacking one(Arthur & Bentancur) But the key thing about Pirlo's system that makes me think he can be a key player for him is the winning the ball back immediately after losing it
Pirlo's system will demand a high energy player who can press hard and strong right after losing possession to win the ball back. Music to McKennie's ears. Like I said earlier, Juve doesn't have another player who can do this other than McKennie.
Again we have no idea the kind of manager Pirlo is and know exactly 100% what his system is like but there is a good chance that it will be something like this because of what he said himself but also his history in the 3 man midfield systems he played in throughout his career.
A lot of people think McKennie is out of his depth at Juve but I actually think he is at one of the best situations he can be at for his development.He is in a position to strive at Juve and it will be all up to him to make the most it. I have faith he will step up to the task

Oh one more thing, he's playing and training alongside one of, if not the best player in history, Ronaldo. He will see how a legend trains a day in and out and his next level mentality. McKennie has endless things he can learn from Ronaldo on how to be an elite footballer.
Just got news that the "have to buy" clause was originally playing 60% of games but was changed to trigger if Juve makes Champions League. LOL. Even more proof of the confidence Juve have in McKennie and how this is a permanent move in disguise