600m indoor WB has long been the weakest middle distance record.
When you have someone like Cas Loxom running 1:14.9 you have to consider the quality of that time.
1:14.8 is still weak, but nice run anyway.
Yes, I remember the same comments about Korir's performance last year. People were very unimpressed with it. Saying a whole bunch of negative things (for some reason).
Then Korir ran 1:43.10 last summer (the world leading time). Pretty good for an NCAA runner. Massive progression.
Now the same coach has a guy who is even faster in his hands.