This has generally been the case:
Jakob doesn't have the fastest kick, so needs the pace to be fast.
The field knows this, so they rightfully predict he will need to lead to make if fast.
If the pace is slow (i.e. if he doesn't lead) he risks not winning a medal.
Jakob is not going to take that risk.
The field can't run the 1500 as fast as Jakob, but they can kick well so they prefer a slow pace.
Jakob knows this, so he must go to the front to set a fast pace.
If the pace is fast, the field can't save their legs for the kick and it's much harder for them to beat Jakob.
The field is not going to make it a fast race.
Now enter Josh 2.0 - right now he is faster than Jakob AND he has a superior kick. This means he should be able to cover ANY move and beat Jakob. Jakob is better than the field, so Josh is also better than the field.
So off a fast pace, it's Josh > Jakob > field.
Off a slow pace, it's Josh > field (some not all) > Jakob.
Given that Jakob needs to medal, he will make it a fast race. No other runner has the same incentive to do that. They will wait for him to take the lead. They will sit on him. They will try to outkick him.
If Jakob takes a massive risk of not leading, Kerr is the next runner with most incentive to make it fast to secure a medal. So in that case, he may WANT to take the lead. He will not take the lead until at least 600 though, no matter what unless he is a damn fool (I believe he is not).
It's not hard to see why Kerr is a strong favorite.
So how can Jakob win? 2 ways:
1) He becomes faster than Josh and solos a 3:26. That way Josh and the field's kick likely don't matter. I'd be ready to throw him in the GOAT discussion if he could pull that off.
2) Josh and field tire themselves out fighting for position and don't have enough left for a superior kick. Jakob would need to run a clean race and a lot of luck for that to happen.