And before her Aleighsa Welch and Ashley Bruner were both 6-0 posts who led USC in rebounding before Coates joined the team and Ibiam found her game. Staley's first 2 NCAAT teams had them as her primary post players, with guards Ieasia Walker, La'Keisha Sutton, and Markeshia Grant. Those teams were Staley's best teams defensively, finishing in the top 5 nationally in scoring defense both years, and that defense began with her perimeter players. But they weren't very deep in talent, were not very good scoring teams, and when it came time to compete against opponents with length, like Stanford, Tennessee, UNC, etc. they were usually dominated on the boards.
Also, during the Gamecock's national championship season, when Coates was lost to injury, PG Bianca Cuevas-Moore - who had lost the starting PG duties to freshman Tyasha Harris earlier in the season - was put into the lineup more alongside Harris as a ball-handling guard in the shooter's spot. The team seemed to flow quicker with the two guards as well as Davis and Gray, while Harris continued the ball distribution role that Cuevas-Moore was a little too erratic in, but Cuevas-Moore's speed factor and in-your-hip-pocket defense helped rattle opponents during the tournament run. Nothing negative regarding Coates as she was a dominate player for the Gamecocks, but I think Staley had been trying to find ways to speed up the team's offense for a while (having former Vanderbilt HC Melanie Balcomb on the staff as an advisor was one way to do that), and having more guards in the unit was a way she better identifies with.
It seems like Staley wants to try having better talent at the guard/wing positions in terms of scoring, while still have longer posts around 6-2, 6-3 who can present a better physical presence in the paint, but who can also face the basket and step out a bit, and move better in transition. So in the end have a faster tempo for a more aggressive team, particularly defensively but offensively too.