Sad news from Panic! At The Disco :'(

Brendon posted a message from Spencer on official website. Spencer is leaving P!ATD soon. I'm so sad and sorry to the band because I've been loving original PATD members and music.
Brendon is only one member in the original band finally...
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I didn't know Dallon is a official member of PATD since 2010... I thought he was just a touring member. :/ When does Brendon announce it....?