"Can one owner evict the tenant without consent from the other owner? Can one owner "contest" or stop the other owner from proceeding with the eviction?"
*** Actually, the CORRECT answers to both questions is.... maybe (and not the 'can be' answer of CA LL).
Was the lease signed by both 'landlords'?? If not, then you should confirm with the 'signing' landlord what your payment obligations are.... and get it in writing. If in fact, both 'landlords' signed the lease, then you may have to look at the way the title is listed and see if both names are on the title. If only one, then again get the payment instructions in writing. If both, then you are going to need to try to get the parties to advise you (again in writing) as to the payment instructions.
Finally, if you still are unable to get instructions in writing, make the payment out to BOTH persons and send the payment to the address shown in the lease (or later written instructions) and be sure to keep copies of the payment. That way, if either party tries to initiate eviction proceedings, you can show the court copies of your payments having been made.