Kammala jumla mai zuwa: Osoro ya wakilci Kenya sau biyu a fagen duniya a 1991, yana gudu a gasar tseren tsere ta duniya ta IAAF ta 1991 (inda ya zo na biyar a tseren tsere mai tsawo) sannan kuma a kan hanyar a gasar zakarun duniya ta 1991 a wasannin motsa jiki (an cire shi a tseren mita 5000 ta hanyar kunkuntar bambanci da Dionísio Castro). Koyaya, ya sami lambar yabo a tseren mita 5000 a Wasannin Duk Afirka na shekarar 1991. Ya bayyana a tawagar 'yan wasan kasar Kenya na duniya a karo na biyu a gasar cin kofin duniya.
1992 IAAF World Cross Country Championships, kodayake bai yi nasara ba a wannan yunƙurin kamar yadda ya gama a matsayi na 23. Daga cikin tafiye-tafiyensa a kan hanyar, ya ci nasara a Belfast International Cross Country meet.