When it comes to assessing fullbacks, I analyze them in the following manner.
1- Physical profile. This includes their pace, strength, and size. Pace is important because opposition wingers are often the fastest players on the pitch. Also if your FB has pace they can cover ground better meaning they can hold width giving you more attacking options. If they don’t have pace, they’re limited to inverting into midfield or dropping into a back 3 in possession.
Rico doesn’t have the pace needed to defend against the fastest wingers and he doesn’t have the pace to hold width.
So if you don’t have the pace, well do you have the strength to hold off your wingers? Will you get bullied by the likes of Semenyo and Leao or will you hold your own? I think we know the answer here.
So he doesn’t have pace nor does he have the strength, does he have the size? Nope. He’s like 5’5. You can’t rely on him to defend headers in the back post at all. That being said, tbh you don’t need to be tall to be a great fullback. Lahm, Alves, and Carlos were all short. However, they compensated with their pace, attacking/technical profile or defensive profile.
2- So we know Rico doesn’t have the physical profile. Let’s assess his attacking/technical profile.
Rico is good technically. He’s agile and he can control the ball well. Low centre of gravity means good press resistance. He has good fundamentals. However, he’s a jack of all trades who’s a master at nothing. I don’t see anything he does on the ball and think wow he’s elite at this one specific thing.
His passing range is poor. He doesn’t have a through ball in him. So you can’t compare him to Trent. He’s not a great dribbler so you can’t compare him to Ait Nouri.
3- Then if you look at his defensive profile, it’s like he’s already at a disadvantage due to his physical profile. But how are his defensive fundamentals? I actually think they’re okay. I don’t think they’re bad per se. I just think he tends to occupy really high spaces that his lack of physicality stands out more when running back. There’s a reason Nico O’Reilly who never played LB looked good there because he could compensate for his lack of defensive awareness with his elite physicality which Rico can’t.
So why does Pep persist on playing him? Well it’s because Rico’s movement is exceptional. That’s literally his only world class trait. The way he drops and opens spaces for others is very good. There’s a reason when City attacks that he often finds himself in positions you wish the attackers would be in. He’s ridiculously clever. It would be like if Thomas Muller played RB.
But then that begs the question.
Can a RB who is physically limited (small, slow, weak), technically good (not great) with okay defensive fundamentals (let’s say 6/10) scale up and become the starting RB for one of the best teams in the world?
My answer is no.