FaZe and Natus Vincere have now come to an agreement to transfer GuardiaN to FaZe in replacement for Allu. Guardian will be taking over the main AWP role, as this was the position that Allu previously played. GuardiaN will make his first appearance later in the month at ESL Pro League.
I had a conversation about this with 
Words from GuardiaN
“Thank you to Na'Vi and all of the fans for supporting me these last few years but i'm excited to start this new journey with FaZe Clan.”
Words from RobbaN
“We’re thrilled that GuardiaN will be joining the team and the players are excited to get back to work after the break. And thank you to allu for all of the hard fought battles over the past year - allu is an incredible talent and we wish him the best of luck on his next chapter.”
Source - Faze Clan Statement
-Nesbitt