Yeah, who knows but intelligence and knowing how to work with a pitcher was his strong suit which theoretically would seem to cross over well to managing.
As for the Red Sox troubles so far, strikeouts, leaving men in scoring position and errors could be seen as pressure. To add to that, team batting average, OBP and stealing bases are all good, stats less related to scoring. It could be their approach to batting like swinging for the fences when a single would do but either way, pressure or batting approach, the manager has some responsibility. I personally think they feel the pressure of having to perform after having such a big off-season and feel they have to live up to that.