https://jp.motorspor...ルの浮上を警戒-959177/
Hasegawa confirmed the Spec 4 engine didnt meet the schedule because the ICE performance didnt reach the target.So they need more time to develop.They decided to introduce new engine in the recent races.Japan is possible but of course he dont want to take penalty in home race.If its the time they have to introduce new engine and the upgrade is not ready at that time,they may introduce the same Spec engine.
Hardly surprising