And yes~ If I'm not wrong Maki & Konkon & Ayaya had 2 PBs at a very short time before,(I mean PRISM & Alo Hello Goto Maki, See you again & Sweet days, Macchura & Alo Hello 2 Matsuura Aya) so I think it's OK for Sayu have a new solo one next month~!
Also~ I agree with you guys...I don't mind Sayu have a new PB every month!!