I think the first part of those cannon tubes is not very involved in cooling indeed, so it's 95% aero. I Dont see how the rad hot air could reach them early, since the high fuel tanks almost wrap the rads completely.
So there is little or no airflow at 'Teamviewer' IMO, and air transits from sidepods to cannons around 'Petronas' IMO
Unless, Mercedes places some new coolers there, which could explain the sidepod top gills...