With the arrival of the new rule and ruling by the Supreme Court that the law means what is says, many lawyers took that to mean that not only was
joint and several liability gone, but contribution and indemnity lawsuits are gone too.
I'm thinking this is a case where
joint and several liability applies; IncumbentCo can
go after any particular one of the owners
and developers for the entire amount if they feel like it,
and then it would be up to that person to then sue anyone else he thinks is partially liable.