Problem with Eastmond is when he came on the scene he was a great individual talent with huge potential. He has never moved on from that status.
Compare that with other young players with big talent who within a couple of years of making their debuts, were driving their teams forward: Cunningham, Graham or Roby for Saints; Sinfield, Burrow or McGuire for Leeds, Tomkins and Charnley for Wigan, the Burgess brothers at Souths.
Eastmond at Saints was just a bright individual talent, he did not replace Sean Long. It doesn't seem like in union he has pushed Bath to new levels either.
Potential is overrated, he needs to get the right attitude. He was compared a lot to Jason Robinson for his speed and explosiveness but Robinson was streets ahead as a professional.