The reason none of them played corner was they didn't have the hip fluidity, footwork and speed to play the position, on top of being considered as safeties when arriving. Wade got straight up bullied a couple times, just switching to being back on a hash isn't going to somehow change that. You're also forgetting that Malcolm spent considerable time floating between both boundary corner and split field safety along with already being one of the most physical CB's who was not afraid of contact since Winfield. I've still yet to see a DB since him match his willingness and ability to tackle.
That isn't Wade this year, not by a long shot. Some people on here claim Gamble was defending himself for the NFL by playing easy in his final few games of 03'. Well he ended up housing KState and I never really saw any evidence of such claims with my own eyes.
But I've seen it with Shaun and I do not offer that observation lightly. The keys, footwork, angles and responsibility along with the diagnosing of route progressions v leverage & positioning is also vastly different at safety. If you believe that being asked to play on the perimeter this year has slowed SW's development, imagine what yet a far more involving position change will entail? That's not a ringing endorsement if you want him to go 1st round.
Edit: and while I agree there are differences about having a play unfold in front of you, Wade wasn't always offered that advantage in a heavy c3 & c1 system from last year. But if you go back and watch, you'll see him be far more active with his hands near the LOS on receivers than this year. There's a good deal to unpack with his play that film study could help reveal. But to simply call him a tweener isn't a real solution or explanation for the DB we expected to see this year.