Choose pace line

[albatross]

The way i understand it is From one of good race's any of his last ten race.
2 same track and dist perffered but not a must
If above is true what if show wire to wire frist quarter at today dist say 23 sprint at 6f in pp at 6 1\2 or 7f wire to wire fashion in 21 0r 22 which dist do you use as pace line 6f ? asthis is probably most inportant part.