In 1996 , Umarov left the unit because of disagreements with Gelayev .
In 1996 , Umarov joined the command of Akhmed Zakayev , who had also left Gelayev 's ranks to lead the splinter unit Wolf ( Borz ) .
In 1996 , Umarov left the unit because of disagreements with Gelayev and joined the command of Akhmed Zakayev , who had also left Gelayev 's ranks to lead the splinter unit Wolf ( Borz ) .