This is not correct. Each party who signs a lease is responsible to the landlord for 100% of the monthly rent. If the tenants have made some agreement among themselves as to a pro-rata sharing of the rent, which is almost certainly the case here, whoever has been forced to pay more than his/her share to the landlord because one or more tenants failed to pay, he/she can try to collect that amount from the party who didn’t pay. But all this is completely detached from the obligations to the landlord and it’s going to take a very expensive law suit to collect from the non-paying co-tenant.
Thank you, you just substantiated my argument in post #21........