you're mistaken. lisk is a fork from crypti.
one of the guys is a mod over at the nxtforum, going by the name 'Berzerk'. he has not been very active since he joined the crypti team and he is in no way involved in development and never was.

https://blog.lisk.io/olivier-and-max-leave-crypti-to-establish-lisk-3fd60eb0808f#.cni9o2q48


what makes you say nxt failed? failed at what exactly?