Camisa, I get your point and I concede. An OPS of .750 would put Sappelt right around #15 on the list of CF. Add in plus defense and you have an above average CF. Though I'd rather not anchor the conversation around offense and then layer defense on top -- I'd rather talk about both from the very start.
If we use wOBA instead of OPS, we can easily convert it to runs and then add in a best guess on defense.
Simply take a player’s wOBA difference from the league average, divide by 1.15, and multiply that by how many plate appearances he got, and you have a run value above or below average for that player.
A .750 OPS would be in the ballpark of a .340 wOBA, which would be worth about 10 runs above league average. Give him a +5 on the defensive side and a full season of that would make him something like a 2.5-3.0 win player. I think we can all agree we'd be happy with that.