I pulled the stats between last year and this year for both players that left and the newcomers. It's not great.
First, the departures. Castaneda, Collins, and Williams have all taken big steps forward in their shooting percentages. Collins's stats are the most drastic with a 5 point increase in FG% and 10(!) point increase in 3FG%. Of the 8 departures I was able to track, Yetna is the only one who has taken a step back.
For the newcomers, each of the 6 who played last season have seen both FG% and 3FG% fall off. Greene and Boggs are the most painful with 8 and 16 percentage point drops in their 3FG%. The average point drop in FG% is 8.5.