Well the divergent regions of jetstreaks are in the left front and right rear quadrants. That was the common terminology when I was growing up although in college I had a professor that chose to use equatorward entrance and poleward exit region…and that may be easier for someone to imagine and recall while looking at upper level maps.
But my point was there’s a lot of spread with that many members that far out. These regions of extra upper level divergence/convergence within jetstreaks are at a relatively small scale compared to the global and synoptic flow so it’s kind of a moot point. It’s like seeing isobars hanging back on an SLP mean at d15 and reading it as inverted trough potential whereas it’s just spread amongst the differing members.
Also, the base of the trough axes tend to have relatively lower wind speeds so you wouldn’t expect to see a jetstreak like that in that position of the trough anyway. Usually in coastals we have the trough axis to our west and we’re looking for that jetstreak on the east side of the trough and the left front quad somewhere around or inside the benchmark. The classic dual jet setups have another jet to our E/NE and the right rear quadrant paired with the left front one along the coast.