Seems like a circular argument [pullrod vs pushrod], but doesn't it seem that going back to pushrod would just entail more problems? If it is true that they have problems with the FW end plates, this means that they would have to fix the airflow from the FWEP and around the tyres, PLUS the airflow that passes through the suspension arms (because they changed to pushrod)? And add this to all the problems regarding sealing the diffuser and the exhaust gas flow. Seems like designing a whole new aerodynamic package to me.
If it's true, and I would like to think it is, that their mechanical grip is sound, then why fix something that's not exactly broken? As many of us here agree that kinematically, pushrod and pullrod are just the same.
Please correct me if I made any mistakes, I'm not an aero guy.