@Armaan ,
@hilts , moved here as we went too far in Evans thread :)
Well, we'll buy them. DM and probably DLP. Right now we have a poor pivot and 3 good CMs - KdB+Silvas (actually, 5 if we count Gundogan and Foden) which is enough to win this league. Enough to implement the game model to steadily develop it, no need to switch to a different way of playing. Otherwise Pep's appointment stops to make any sense.
Some players are changing their positions and learning new things, but it's normal, it helps them to bring out their best qualities. That's why all the talk about 'playing out of position' or 'using 10 as centre mids' is a nonsence, it became clear in 70s that total versatility is the way forward, best coaches were talking about it for ages. I don't think 'tactics' or 'formations' are that important for Guardiola, he teaches players to make good decisions in any situation, not to play '10 role ' or 'midfielder role'. Watch the games of 2012 Barca - tactical setup was hardly of any importance as the players were so good that they could act according to the situation and adapt quickly. I remember one of the Clasicos when it was impossible to say what position Busquets is playing - CB or DM, he was shifting seamlessly.
You're referring to Kroos and Modric, but Madrid's tactics isn't a benchmark, it has many flaws and is fairly conservative, Pep knows about possession game much more than Madrid's staff. So don't worry mate, he knows how to train midfielders. And you're surely overestimating Casemiro, he's just an average ball-winner playing in a very good team. Performs his functions well though, but Pep would sell him to play someone like M.Llorente, I have no doubt about it.
I'm not saying that midfielders shouldn't be 'Bassetts'. They should, but not at the cost of ball-control/passing/press-resistance!
To put it simply, every player should have 'a bit of defensive nouse' and be able to take part in a build-up without losing the ball. Guardiola teaches that a lot. Have you noticed how D.Silva's pressing/defending has changed? Can he get stuck in now?
There simply shouldn't be a division into defensive and attacking players, all are defending and attacking, including striker and keeper. Thus the discussion about adding more defensive players doesn't make any sense. If we can find the 8 like Davids who combines good ball-control with a phenomenal defensive tenacity, fine. But if we don't, we'll make Bernardo Silva perform the same functions. Since the team defends mostly by pressing/closing passing lanes/setting traps, he doesn't need to jump into tackles to be effective, those days are long gone.
It's more important to retain the ball and save team's energy than lose it 10 times and use Kantes to tackle opponents.
As for 'plenty of European sides' - Guardiola is slightly ahead of his time and such comparisons don't work. Watch 2008-2012 Barca, all answers are there.
Edit: Of course, all players should defend well. That's why I can't understand the recent 'Sane can't defend, he's ruined as a wingback' stance. If a wing player can't defend, in an ideal world he shouldn't play at all, be it winger, wingback or fullback. Or man up and learn how to do it.