I'd say Jakob was robbed the opportunity to win the 5000m gold (and thereby completing the double) in Tokyo 2021.
There was only one day between the 1500m final and the 5000m final in Tokyo. When El G did his double in 2004, he had 4 days between the two finals, and when Lagat did his 2007 double, there was also 4 days between the two finals. In order to win both, you have to run 5 races in total (heats, semi-final and final in the 1500m, and heats and final in the 5000m).
Jakob had the world lead in the 2021 season. He ran 12:48.45 in Florence (with a final lap of 56.0), beating runners like Gebrhiwet, Ahmed, Katir, Knight, Cheptegei (the eventual Olympic champion), Haile Bekele, McSweyn and Edris in the process. Cheptegei won in Tokyo with a time of 12:58.15, and a final lap of 55.10. And he toyed with the entire field in Eugene 11 months later. I don't see how Jakob wouldn't have won the 5000m final in Tokyo (IF the 1500m and 5000m finals were 4 days apart)
That schedule really annoyed me (still does). The 1500m and 5000m finals were several days apart in Paris 2024, as wells as in Doha 2019 and Eugene 2022, so I don't get why it was like that in Tokyo 2021. Really stupid.