(I will copy-paste what i wrote somewhere else you tried to launch the subject...) :
I hope they will ! Cherisse and Martin are soooooooo good !! I absolutely love them ! Hope they get along all together for a while...
If you read the credits on the album, you can see who's playing : Greg Wells (producer) is playing drums, guitar, keyboard on many songs, Matt Chamberlain is on it too, Mika even plays percussions on Love Today and many instruments actually ! Actually, none of the actual musicians are on the credits...
I think Cherisse denied a proposition to go with Mika... Or she was working with someone else, that she left to be with Mika. I don't think she would leave him now if everything is ok between them !
I don't know about the other members of the band... I don't think Martin was working with someone in particular before Mika called him and I know nothing about Michael Choi and Luke Jubby.