Brezovan
Greer
Crofts (originally)
Barnes
Calderon
Ankergren
Lualua
Bridcutt
(ignoring players who have come through the youth set up, or who have been with us since before Gus - eg El Abd, JFC etc)
And if said "league 1 player" played a significant part into the team getting to tenth in the first season, then built on that achievement and followed it up with a second championship season in which they finished fourth in the division, suggesting that they are capable of succeeding in this...