There are seven appearances missing for Joel Tomkins in the database for the 2014 season.
He is the missing substitute in the game below:
http://www.rugbyleagueproject.org/seasons/super-league-xix-2014/round-23/wigan-vs-salford/summary.html
The other six appearances are mistakenly credited to Logan Tomkins, who moved to Salford on loan during the middle of the season.