Just got my kit. I plan to install a samsung pro 850 ssd while keeping the existing 1tb spinner. Quick question about position of the drives. My spinner is in the lower drive, so I bought the appropriate kit from OWC. The video shows that I should put my ssd in the upper bay and keep the existing drive in the lower bay. Seems pretty straight forward. Doing a bit of research I noticed a lot of people on the ifixit site said that they had to swap the position and put the existing spinner in the upper bay and put the SSD in the lower bay. Not sure what to believe, as it seems people using the OWC kit do not have this issue. So does position matter? Just want to make sure I do this right the first time.