Yeah, he tried him out there, so ? That's what pre season is there for. He didn't start in midfield in competitive games until we had our injury problems. And even when he did play there, he was great. Tactical flexibility seems to be a bad thing for you...Talking about "Barca's and Madrid's trashing can". Isn't it ironic that Lahm played RB when we got beat 4-0?
Alaba started playing CB last season.
1) When Benatia came back from an injury he had when he was still at Roma and didn't get to full fitness.
2) When Dante was the Dante we know today
3) Badstuber just came back from a ~2 year long injury spell
4) And guess what, even Boateng needs a rest some day
Also, when we had other CB options Alaba usually played the left defender in a 3 at the back formation, the position that comes his desired CDM position the closest. But I guess because you play 3 at the back it always has to be 3 center backs

"Turned" into a CB is also quite funny. He didn't turn Alaba into anything. Alaba has always been the flexible beast he was. Pep's lucky he has a player like him that gives him so many tactical options.
That "spanish guy" deserved his starting spot last season because he was extremely consistent. But i guess it's better to be polemic and accuse Pep of prefering spaniards just for the sake of it.