What if : Zayd b Haritha [ra] first caliph ?

I enjoy alternate history, would people care to speculate what might have been the consequences if Zayd al-Hibb[ra] did not die in Mootah but became Prophet[pbuh]'s successor
esp. since he was a freed slave and most commonly believed to be a non Quraishi/african descent ?
Who would have been his successors ? How would his administration be different or similar to the actual first 4 caliphs ?

Please try to keep sectarian polemics to a minimum