That is the on of the drawbacks of the highline. I suppose he should follow Cubarsi. But my guess in these situations he decided to play it safe and dropped back.
A combination of both. Poor timing by Kounde and wrong estimation of last line by Inigo. I watched it many times over, from different angles.Inigo has no real blame in either goal. First one is more on Kounde who leaves his position to intercept a long ball by Atletico but is owned in the air by the AM player. You can't play offside there.
It's good his injuries this season mostly coincide with international breaks. I think he won't miss many games and will be ready for Dortmund.