You have got many troll answers. I will give a serious one.
If all 3 are at their prime Jakob will win.
See this video from DL Lausanne 2023 where Jakob easily holds off Kerr in the last 100m.
And if people think a healthy Jakob can´t replicate this win in a championship race then remember that the Lausanne race against Kerr was Jakob´s second slowest race in the season before Budapest.
In his fastest race (DL Silesia) he ran more than 1.5 seconds faster than in Lausanne WITH LIMITED HELP FROM THE PACEMAKERS. Rewatch the Silesia race here:
Wightman beat Jakob last year - as discussed many times on these boards - because Jakob waisted energy when holding off Tim and Kipsang. But that wouldn´t happen in this 3 men´s race so Jake wouldn´t stand a chance against Jakob who - to make it even worth for Jake - is one level up from last year.
By the way: I don´t see Wightman ever coming back to his 2022 shape. I understand that he got a stress fracture in his foot in January this year but find surprising that he hasn´t recovered for that injury long ago. Apparently he has suffered from additional injuries but in his age this might be the end of career as a toprunner.
Just ask Tim or Henrik and Filip Ingebrigtsen how it is when the injuries get chronic.