User blog comment:Fistful of Force/Xin Q vs E/@comment-5266525-20130206114938

Starting E would be atrocious. It has a horrendous cooldown at level 1, made even worse since Q isn't available for its flat CDR. Killing the big minion first is of top priority and E is AoE - not helpful.

You CAN start W if you want to - you trade speed for early sustain - but I generally find it's not that useful since a decent leash should be more than enough to quickly kill the monsters before they've done any significant damage to you.