In terms of actual number of people on the roster, if you don't count the cruiserweights, it's suprisingly really close on both sides, like within 1 or 2 in each category(men's singles, tags, women). Wife's been keeping a spreadsheet.
Then you look at where the injuries happened.
SD tags got derailed by Hype Bros injury. Eva's gone more or less but her spot has been filled by Mickie.
Raw Women's division lost 2 of their initial 7 to injury(Summer, Paige). Extra bonus points for Sasha bruising her back in the weeks leading up to Summerslam forcing a Charlotte win and Bayley call-up.
I do have to say, though, throwing everyone in the division in one giant clusterfuck match is really the Smackdown signature. 5/6 way matches, gauntlets, dual contract singing, etc. Add gratuitous worked shoot promos and heel sneak attacks and you've got the formula.