The fact that those players you mentioned have played those number of games doesn't change the fact that they are still inexperienced. Most of the other teams in the Magners have experienced international players all over the park. Even if Jon Davies has played 50 times for the Scarlets, he's not exactly as experienced as the likes of Shanklin etc, and more importantly he doesn't regularily have experienced players around him. For the majority of games played this season in the Magners league the Scarlets backline has consisted of: Martyn Roberts, Rhys Priestland, Jon Davies, Lamont, Fenby, an other winger, Dan Evans. There isn't one properly experienced player there (not playing in position).
The pack is a little more experienced with Iestyn Thomas and Lyons. But Pugh is little more than a discarded player from the other regions (would have been better to keen Gavin Thomas), and isn't a top quality player imo. Dafydd Jones was a big player for them at the beggining of the season, and they've missed him hugely. Easterby is well over the hill. Owens is a great player, but not exactly experienced!
It's taken a few years for the youngsters at the Dragons to gain the experience necessary to compete with the bigger teams. Same will happen at the Scarlets. It takes time unfortunately when a team looses so many players to retirement and injury. The Scarlets mistake was not bringing through the youngsters when they were performing a few years ago, instead relying on the likes of Dafydd James etc.
Saying all that..........
I do agree that Nigel Davies and the rest at the Scarlets aren't really the quality they need. However, there is no money there at the moment to draw a top quality coach in. Next season is important though, another failure of a season and Davies should go, as by then the inexperience card is really wearing thin.