What?! The guy said 'Picking a team by training statistics is not the way a manager should be doing it'. That's a very definite statement and an incredibly arrogant one since every top manager in world football picks their team that way.
Disagree with Rafa's team selections and tactics by all means, but don't make definite statements that he's wrong. None of us are qualified to make statements like that, least of all GeordieJeans
The guy made an assumption, like all of us do when it comes to the club because there's so much we don't know about what's going on, and he gave an opinion.