Whitfield could be a mid-forward, he's been classified as such by champion data this year. Danger is classified as a mid at the moment. Source for that is their player ratings twitter page.
Early thoughts on locks would be:
Def: Jake Lloyd, Laird
Mids: Titch, Josh Kelly, Oliver
Rucks: Grundy Gawn
Forwards: Heeney and Whitfield if he's a mid-fwd.