Warren isn't "always open" as seen on the 4th down play at the goalline--depending on the route he can throw it to him in tight coverage (we say the 50/50 ball to Warren last week) but not every time. There's never been a player in the history of the game that was "always open".
Wallace hasn't shown the ability to do that and after dropping the TD last week I'm guessing his looks will be limited.
Most people are overreacting to one game against the best team we've seen or will see.
Wallace not only bobbled a beautiful pass from Allar in the end zone, he got outmuscled for the ball. It seemed like he did not fight for it like Ohio State’s DB did on that play.
Basically, the Ohio State DB took Wallace’s lunch money without much of a fight.