If you normalize their stats (because Wainwright has been around longer), Wainwright and Arrieta are relatively comparable.
Not really. Arrieta was a flash in the pan, while Wainwright was a legit number 1 (or 1b) starter in MLB for mostly a decade.
Edmonds and Rolen played more than half their careers elsewhere, so by your own reasoning, they don't count (and neither is getting into Cooperstown without a ticket, so it doesn't really matter).
Their peaks were as Cardinals, which is what I was talking about earlier with the Hornsby, Dean, etc. examples.
Granted, Rolen only played 6 of his 17 seasons in St. Louis, but he won 4 of his 8 Gold Gloves here and appeared in 5 of his 7 All-Star games as a Cardinal.
Edmonds played 8 of his 17 seasons in St. Louis, winning 6 of his 8 Gold Gloves as a Cardinal and appearing in 3 of his 4 All-Star games as a Cardinal.
Neither will make the Hall, but that's only because the baseball writers who vote are idiots (I have said this for years). Rolen and Edmonds were good offensive players and elite defensive players, which rarely gets you in anymore. Had either been an elite offensive player and merely good defensively, they'd be in. Voters rarely care about defense, except in rare cases like Ozzie Smith.