SITUATION
Of the seven (7) core races (4 primary, 3 added with expansions) only two (2)* are currently led by the character that they were introduced in WoW with (Blood elf and Pandaren). Three (3) including Thrall, though he left the Horde for a time (pre-cata through post-BFA) before recently returning as the Orc racial leader.
The Horde has lost eight (8) racial leaders to death, villain-batting or both.