Good point, but even drawing with Palace will be difficult and no team can play for a draw if the other team does not need to.
Palace will have absolutely nothing to lose and so can just play their best football whereas Villa will be so nervous not to lose if Spurs win tonight.
I remember a few years ago when Spurs had CL football in the bag and we (Arsenal) needed a large difference to get CL and Spurs lost 5-1 to an already relegated Newcastle team and we got CL football.
Of course, Sheffield could do the same to Spurs but I don't care about that as long as Spurs win tonight.