Gordon is better than Marshall, and Marshy was one of the best keepers in the Championship. Tierney looks a hell of a player, Lustig is a Sweden regular and their centre backs aren't bad. Kolo Toure played 9 games for Liverpool last season and can't get in Celtic's team. Armstrong and Brown would be top Championship players, Sinclair (who scored 19 goals in his last season in the Champ) and Roberts would be too good for the league, and Dembele and Griffiths would score for fun.
Newcastle just won the league with Paul Dummett and Ciaran Clark playing regularly.