Woh bud, not advocating that at all. I'm simply saying that you have to evaluate players within a system, as that is the best way to truly assess strengths and weaknesses of a current squad, as well as assess compatibility of possible incomers. For instance, what does it matter if a striker is the best aerial battler in the world if he comes to a team with a system such that they prefer to work the ball through on the ground? No, I certainly don't advocate a system over a player, I'm just aware that Poch is very good at making his system apply to unexpected players at a club who may not necessarily be the "believed" best.
Therefore, it is impossible to assume based solely on last year that Rose being replaced is the priority. If you believe it so under consideration of Poch's tactics, as you declare to be aware of, then I quite literally have no argument for you and am only intrigued as to your rationale. But this last part is my entire point, not advocating systems, or "glossing over" anyone, or even that Rose wasn't a weakness last season.