The engine and radiator exhaust thing is an interesting one. Looking at the top of their sidepods it's almost scary how simple and clean they have made it. There is absolutely nothing to further obstruct the flow to the rearwing there, apart from the chimney(?) winglets, which improve the flows there. I'm just wondering how this approach has left them on the engine cooling department, which is very important this year. Comparing to for example Renault.
But then again, this is Ferrari and I don't think anyone here thinks they don't know what they're doing.
Even if Byrne has faded to a simple supervisory role in the team. And perhaps the lack of cooling is a testament to the ridicilous reliability of the ferrari engine, and the renault approach is just the necessary precaution to make up for their nagging engine reliability issues?