I noticed this the other day when I finally took the chance to try him again after his bug fixes.
I think that originally, the distance each soldier could dash was based on a range from the soldier itself, not a ring around Azir. That made more sense to me, even though it sometimes meant that you couldn't get all of your soldiers to the same spot if they were too spread out. It just meant each one dashed as close to there as it could get.
With the soldiers limited to a bubble around Azir, I'm having to expose him to a LOT more danger, which is a huge problem when combined with his unique targeting mechanics. If his Q has to be based on a bubble around him, then it needs to be much larger. Honestly, though, I feel like it would just be much healthier to base the range of each soldier off of their own location, not Azir's.
EDIT: To be clear, I don't want Azir to be totally safe, since that would break him. However, I feel like he's exposed to too much danger in his current state. He practically has to be on top of enemy champs to get a full combo off, and this is at odds with his "hide behind his minions" advertising.