you mean if I missed how it was all assumptions? No, I did not miss that. Did you miss how the OP himself changed his tone a few posts later?
It's all assumptions and what if this and what if that. LOL
The only truth is that there is a post in Craigslist, from the singer, mentioning he is in a covers band and wants to do originals now.
Anything else is... imagination and assumptions. The OP has no "evidence" that he is being replaced, he just worries about it.
So... again... if in doubt: ASK the singer what his plans are.
We at TalkBass have no clue about his intentions

ONly that the post he put on Craigslist talks of a NEW project, and says nothing about his intentions for the old one. It's a new band.
You cannot replace someone in a band that has not even been formed yet.
The singer is free to start another band with anybody he chooses, or do you think you form a bond with your bandmates that means you have to play always with them and only with them?

The singer does sound like someone I would not like to play with, but the OP clearly wants to stay in the covers band for whatever reason, maybe it's just for money (that can be a good reason!). The OP states he does not think he is being replaced in the covers band. Cool. Then... what is exactly the problem?

On the one hand, the covers band is a band he has been wanting to quit for a while (for a while? it takes a second...

) but now he changed his mind as they are playing better gigs and this was his money-making band (fine, we all work with people we don't like sometimes). Then the same PITA singer is starting a new band, originals (unlikely to make any significant money for a while, and which will require a lot of work to get off the ground)... and the OP is hurt he has not been asked to join?
Is thsi really just an ego thing?
If he is a PITA and you only stay in the covers band as it's making money on decent gigs... why would you want to spend a lot of extra time on something that would not be gigging or making any significant money for a long time?
But hey, whatever, if the OP changes his mind and thinks he'd like to be involved... then all he has to do is ask the singer about his plans. Then he will know for sure whether the singer wants him in that project or not. All this drama is unnecessary, and all the people half reading things and making assumptions... too.