I wouldn't say Wes has regressed. Has not improved to the degree I hoped, but no regression.
Shane was probably overrated, at least in the sense that the ceiling people assumed he could hit was way too high. Also, as already expressed, Rodney made him look good. Four years under Weber for Shane would not have resulted in a better player.
DJamer is the only guy I've seen significantly improve under Weber, but it is hard to judge when he runs so many players off. He can play that card to get four more years.
Also, remember when running players off was a Frank problem? JFC