I think that unfortunately Nimo never found again his way after ACE's disbanding. He is an amazing singer. I love this music, it makes me go to the past and feel something very good about it.
Bands steal from one another all the time. Look at Children of Bodom stealing a bunch of riffs from Dissection. Alestorm's 'The Quest' is a blatant ripoff of Rhapsody's 'Emerald Sword'. Just so long as it's not copy and paste, it's fine imo