2 minutes ago, Madaghmire said:
I can see his point. Either way you are throwing 4 red dice, probably at least one comes up blank. And so you save 4 points.
The difference of course is that with spinals, if you roll four faces that aren't blank, you get to count them all.
And of course thats before we get into whether you are running Vader/veteran gunners/leading shots/gunnery teams
It's also a "Modification", so there is an opportunity cost there as well. Gunnery teams mean no Ordinance Experts or Flight Controllers, so there's that cost with them.