All of them, hence why they were genuine bolters at the time.
As for Smith, he's been pitting in consistently excellent performances for quins for a few years now and should probably have a number of caps for England by now if Jones wasn't such a fuckwit. He's not come from nowhere in the space of a couple of months, he's been building and building.
As for Europe, fair enough I suppose, but that's a team thing, hence why I brought up the Ireland WC thing earlier. Those failures aren't on Sexton, and the European failures aren't on Smith, but of the team as a whole inc. coaches given the turnaround since Gustard's departure.
Harlequins being poor in Europe and Smith being a very, very good player - both statements can be true.