And agility is one of the cornerstones of being a good number 8, if you can't turn under pressure with your back to goal then you're not a number 8. The idea that he can be like Yaya is fanciful because he doesn't have the technical ability either.
I agree flexibility is important, and Emre is flexible as a footballer but the whole point of that flexibility is that it's usually for one off games. Players need a degree of stability otherwise they'll never get comfortable enough to play themselves into form. We were about as flexible as anyone under Brendan but it gradually became an issue when it came to the cohesion of the unit (heck even Jurgen gave a jab at Brendan over Sahin for not playing him in his best position).
I agree he'll probably never reach Yaya Toure's heights in terms of goalscoring, but at 23 Yaya was in the Greek league and nobody would have predicted he would ever be a double figures goalscorer (let alone a one-time 20 goals man!). I definitely think Can can play there - I still don't think there's this huge chasm, if one at all, between him and Wijnaldum in that role which people make out.
I agree with your last paragraph in fairness, think that's a well made point, but equally I don't think Klopp moves players around as much as Brendan did. He does try to play them into a run of form but obviously injuries and in particular a lack of squad depth can change that.
Personally I'm just bored of hearing 'Firmino can only play as a 9', 'Can can only play as a 6' etc when it's patently not true. Firmino had his best game in a Liverpool shirt on Sunday off the right and Can's had several good games as an 8.
Also I'm not sure either of those players for example are of the required quality or consistency (yet) to build a team around in one fixed position, and moreover I think they genuinely are very versatile footballers, as are Milner and Lallana.
Sounds like Fifa 17 rhetoric.
Does it? That's cool.