So far Caterham have played safe, big cooling inlets, they have also completed most laps, albeit at a slow delta to other engine families. This suggests once Renault sort out their engine issues Caterham should be able to start looking at going faster as their car appears like its actually working (without holes drilled in for extra cooling)
If Newey redesigns and plays safe with cooling, the car aint gonna be fast. With the Merc and Ferrari they have advanced and robust solutions for cooling vs aero balance. So Newey has to come up in a couple of weeks with a solution that allows tight packaging at the back for downforce AND also allows enough air to actually get into rear.
Is he really that clever to be able to come up with something, build it, test it, fine tune it, when its taken other teams months if not years to come up with their solutions? Can he come up with something that looks like the Merc and Ferrari solutions - 'small sidepods-channelling aero to tight rear for downforce' or what he had before, front aero to floor to rear this time with bigger sidepods, meaning less DF at rear?
Has he got time to come up with something as complex as Merc/Ferrari that allows him to keep small side pods (more rear DF) and small inlets (faster aero) AND still cool the PU properly? (forgive the conceptual simplification of the design)
If he does all the engineers at Merc and Ferrari will surely be sacked for overlooking a solution that could be implemented in a few weeks instead of spending all that time