@vrish -- it is really nice to be part of discussion with u all. it may not be from moola katha but
satyavarshiniNo, Shukracharya didn't lose that power - it's just that the asuras lost their advantage. Previously, only Shukracharya knew it, but nobody sympathetic to the devas did, which is why Kacha was sent. After Kacha was restored to life and restored Shukracharya to life, both of them had that capability, but Devyani cursed him that he'd not be able to relieve anybody who was killed despite knowing this secret. Kacha recognized this curse, but said that he'd still be able to teach it to others, who could use it. But I haven't heard of whether Kacha actually taught that to anyone else so that the devasura wars could be tipped more neutrally.