Think Carvahal got into a bit of a similar situation to Rosler with us, where he was afraid to let his players off the leash and play with freedom.
I read an interesting article recently which was talking about how Swansea got promoted, and established as a top flight club, playing free flowing, expansive football. The desperation to keep them in the Prem (and to retain the value of the club ahead of the recent sale) has seen them abandon this approach, which has actually dragged them closer to relegation, doing more damage to the value of the club (the very thing they tried to avoid initially). This appointment seems to underline the desperation.