I saw the race in which Evan Jager tripped. The guy is capable of breaking the world record.
No doubt about it, considering the progress he has made in such a short time. He is going to be the first American to do sub-8; in a sense he already is, given that he clearly would have done something like 7:56 in that race. The time tomorrow will be an interesting one if they all go flat-out. Kemboi had the fastest times in the heats today, but I have my doubts about him.
I could be wrong, but I think Birech is the most serious of the Kenyans in there and possibly has WR stuff in him. He did 7:58 in that Jager-disaster race, which is consistent with his performance (when pushed) in the last couple of years; on the other hand, I can't remember when last Kemboi posted such times.
I noted that you are rooting for Conseslus. Anything is possible, but I don't see him as quite there yet. Against Kemboi, for the gold, it could easily be a Lion-And-Jewel sort of battle. Birech on the other hand is only slightly older but seems more focused and is also a little more experienced in this sort of thing. I'm going to bet on Birech, and I think he could do something spectacular if pushed hard enough.