Before the USC game, I had the same feeling regarding Sheffield. But, he was very solid in coverage all night against a really good set of WRs and a super talent QB in Darnold. I'm pretty bullish with my expectations of how well Sheffield will perform this upcoming year.
With Arnette, he would need to put together an absolutely stellar season for me to forget about the number of times he's been singled out in coverage. Some bad memories burned into my brain.