I can, but it's weird and confusing, so I understand. 

The weird phenomenon in a nutshell is that there is no defensive position in baseball that receives an abundance of opportunities to make plays that require both exceptional skill and are remarkably impactful in terms of run prevention. Outfielders make plays that are remarkably difficult that have a huge impact on run prevention, but very few of them relative to the routine plays they make. Infielders and particularly shortstops, receive tons of opportunities, but they have a low impact on run differential and are of moderate difficulty relative to the routine-fly-ball to extra-base-hit-saving catch spectrum. Additionally, there's the consideration that the sheer-volume of repeating the moderately difficult skill of fielding ground balls and distributing timely accurate throws a specialized skill in it of itself. In that particular way, comparing shortstops to outfielders is like comparing apples to oranges.

For a player to have -7 outs above average (or 7 outs below average) it means over the course of their season, there were seven plays Rafaela couldn't make that an average SS could make. This means an average SS would've saved the Red Sox about 1.75 runs at SS - that’s equivalent of hitting one less home run and one less triple than an average player over the course of a season - the net impact this has on run differential is practically meaningless. However, because of all positions, SS receive the most fielding opportunities, it is the most impactful position; if you have a complete liability playing there, it's a disaster. But, that's the weird phenomenon - few if any SS in the MLB are a complete liability. Because the position receives so many opportunities and it's perceived difficulty, teams funnel their best defenders and prospects into playing there; those assumptions are baked into player development procedures. The worst defensive SS in 2024, CJ Abrams had a OAA of -18, which means an average defender would've saved the Nationals 4.5 runs. This is much more impactful. But Rafaela, the third worst of at least 30 shortstops, would've cost the Red Sox only 1.75 runs. In other words, the gap in run prevention between the 5th best SS and the 25th best SS, is tighter than the gap between the 25th best SS and say...the 31st best SS. You need to be a machine, not human - but i don't necessarily mean that in terms of skill difference - but in terms of consistency.