Superstar Showdown positions

Can we please talk about why and how the quarterback and coverage DB position are associated with eachother!!? Can’t it be QB/ ROAMER and WR/DB and RB and coverage DB

only would be fair considering qbs aren’t near as fast as dbs and halfbacks and wide receivers are all fastttttt, PLZ fix this +++ QBs are just not a considerable option for being a man coverage DB AT ALL