As I can remember Dave Weckl left for sabian long time ago. Plus they gave him signature hhx evolution series. Z's lines is very stable and they dwell too much in it, less new lines and signature series may be 1 of the reason i see.
If you noticed Zildjian always say "DEVELOPED WITH" is a big phrase. They don't want drummers to see that the artist did the design. Sila(Zildjian) parin dapat ang genius(at bida) hindi yung artist kaya the seemingly "signature" lines nila will always be part of the existing models.
It's a good strategy since Vinnie Colaiuta help design the A Customs tapos ngayon nasa Paiste na sya. Imaginin na lang naten kung VC Custom tinawag nila sa A custom edi abolish lahat ng models.
Isa pa when they did Cindy Blackman's "Signature" ride. The 22 Dark medium Ride, when Cindy left for Istanbul Agop eh pinasalo na lang nila yung ride as Aaron Spear's Ride. Wala pang 2 years ginawa yung ride umalis na agad yung artist. Hassle diba?? Yun siguro reason nila kaya they don't put the Artist's name sa Cymbal.