Position Starter Backup 3rd string, etc.
C Chandler Jordan Stat
PF Stat Harrellson Novak, Jeffries
SF Melo Balkman Walker, Novak, Jeffries
SG Shump Fields Douglas, Walker
PG Davis Miles Bibby or Lin
You can argue that Fields should start over Shump right now, partly because he is more effective with the starters, partly because Shump might add more oomf to the second team.
It may be that Aaron Miles is not available, or that Lin really should be the backup PG. This is also arguable either way. It is hard to know without giving both some real floor time and proper coaching.
Clearly this is not how D'Antoni sees the world, but I venture to guess any number of other (more traditional) coaches would align with these players better.