If the Ingebrigtsens work together I think Jakob and Filip are 1-2. I actually think we will see Jakob beat Filip and Henrik will be the workhorse. Dad's orders. As awesome as Jakobs 3:31 was, I actually think he can run faster and I think he can beat Filip and just has more upside and potential to improve.
If the race is a slow tactical affair with a leisurely opening 700-800 then it is harder to call. I still would put the 2 Ingebrigtsens in the running but in that type of race so much will come down to positioning that it's more unpredictable. My pick in the slow tactical race is Lewandowski simply because he races those sorts of races intelligently.