The rear wheel splines & final drive pumpkin are easier to align than the front end of the driveshaft. For me anyway.
I suggest using the grey plastic dust ring as a guide to having the wheel in the correct position w/the pumpkin. Try to get even spacing around the dust ring and then a bit of wiggling, and the wheel should slide right in.
You know how the tire when it seats, has a molded perimeter ring which shows the same amount of sidewall space to the edge of the wheel? And how if you don't have the same spacing, that wheel isn't properly seated, and you're gonna have some incredible wheel hop if you don't get the bead to seat correctly? Well fitting the wheel to the pumpkin is kinda like that, except you're not going anywhere w/o the splines properly engaged.