Rules are not clear about partially WL'ed passengers! Some TTE's considering them to be valid passengers (since they have paid the full fare) allow them onboard. Whereas some TTE's considering them as WL'ed passengers do not allow them onboard!
Also if the status remains in WL after chart preparation (E-ticket), you need to file TDR for all the ppl (if none travels) or for the 3rd passenger in Wl (after takin the certificate from the TTE), as WL'ed E-tickets are not automatically cancelled.
Wl1...
more... in RSWL should confirm! If it doesnt, kindly purchase a General ticket, request the TTE for a vacant berth, or u can adjust him with u (with the permission of TTE and no objection from the co-passengers) and thus pay the diff in fare!
However, if the TTE doesn allow u, u are helpless!