Let's just think it this way, without Jaejoong Ayu should still get #1 faring the same amount as MOON/blossom.
With Jaejoong, she could possibly get her highest #1 week sales since Mirrorcle World or Days/GREEN. Either way she would still get #1 just that Jaejoong's participation would probably skyrocket the sales and totally secure her #1 weekly.
Jaejoong isn't God & Ayu isn't all that feeble if she's alone.
