You guys really like to backseat, don't you? Lucky being an 18-year-old talent performed out of his mind on Blast (the biggest LAN of this year, even better production and crowd than the major) in the majority of matches as a rifler. They won against Faze and Heroic in Blast only cause of his insane amount of clutches along with k0nfig and blameF popping off like crazy.
Astralis don't have a proper Awper I agree, but I'd argue they don't need one with this current form. They just need to have more time together and they can have outstanding results with this roster.
If you really want to replace someone for an awper, replace Xyp9x cause he used to be the clutch minister, but that never seems to be happening anymore with his 0.95 rating. I've left a few clips for you to see how instrumental Lucky was for Astralis' successful run in Blast as their first time with the new roster.