i can only come up with 2 possible ideas:
1) has he EVER worked at altitude before? i know he lives low and sleeps in a tent IIRC, but i dont think he's ever run/trained, much less raced at altitude other than this meet last year. i could be totally wrong though.
2) was he just looking to run a hard first 2k and hope the rest of the field would jump ship so he could coast it in for second behind lagat? that doesnt seems like it would be a smart thing to do, but who knows.
unless it really was a "ploy" or workout, this was the first bad race I've ever seen Rupp run in his professional career. i hope nothing is wrong.