Installing front coil springs on 69 C10

[Arl37]

I will wrap up my conversion to disc brakes tomorrow when I re-install the front coil springs and wrap up the details. I plan to use the floor jack method to re install the springs. I did this a lot in the previous century many decades ago but my memory has faded and I have a question. In checking the forum, most commentaries on re-installing the front coil springs say the final connection of the the control arms once you have jacked up the coil spring should be the bottom ball joint. ie the spindle should be connected to the upper ball joint before you start jacking. Seems to me it would be easier to have the lower joint in place and then jack the lower control arm up and just drop the upper cont arm bolt in to the upper spindle hole. Any special reason for using the Lower ball joint as the final connection?