I've been thinking about his position when he comes. I'm doubting that Arthur, Busi, Frenkie would work very well against low defences.
Arthur and Frenkie would be very press resistant as CM's, very much like Xavi and Iniesta.
But they lack that extra in attack. Xavi had his deep runs into the box and Iniesta could get past anyone with the ball at his feet.
As I see it, Arthur and Frenkie would need a more offensive minded player together with them with Frenkie playing as a pivot.
The system lacks the most. When Xavi had his deep runs (which were rather rare mind you, compared with Iniesta's), midfield would re-shape and keep the compactness. This was done by exercise, everybody always knew how to position themselves in a huge variety of cases and situations of play. That was done via great tactics and advanced positional play interpretations by Guardiola, basically a good portion of what makes him a genius strategist in attacking phase: the ability to have players moving around while not losing shape and compactness.
Normally when you move around a lot, the risk of losing shape becomes bigger and bigger, especially when you leave your position and get into another teammate's position. So if you don't know what you are doing, you end up with cluttered areas and areas with gaps. Which is basically the opposite of what you'd want. Every situation of player moving between the lines in modern positional play needs to trigger positional adjustments from almost every teammate. Now, if we're talking about Valverde-type positional play, most of these theories aren't valid, because players stick to their position with minimum movement. Which is mostly why we create 3-4 chances with 75% possession, and Guardiola creates 15-20. With the same players in terms of quality.
If we try this shit today, with this manager, we'd get ruined on transitions because holes would be created when our midfielders would be adventurous. Which is probably why we prefer parking the bus when we meet a serious team lol.