I don't imagine that our choices were the same as there are some specific Warlock spells I have access to and I think there were only 5 choices in total. Sage has taken a very specific utility spell.
Drosku on the other hand had even less choice and I think may have taken the one you are alluding to. Let's just be glad he's likely to be leaving us soon.
Incidentally, I totally forgot that Drosku does have access to the Resurrection spell, he just didn't have it prepared at the time and would have been able to get it ready after we had our long rest in the cave. So he totally could have brought Inileth back.
Edit: Just looked at the Sorceror level 8 spells. Out of the 6, Sage had access to 3 of them. Power Word Stun may not seem like much but it is an incredibly powerful spell at totally shutting down squishy spellcasters, sometimes for entire battles.