To me this debate comes down to the odds. There are more mobs in Einherjar with TP moves that flat out wipe shadows, thus nullifying Utsusemi's effectiveness, than mobs with TP moves that Utsusemi will protect you from (Body Slam, Fluid Spread, etc.)
And let's be honest, it only comes down to TP moves... because if your melee have to rely on shadows to blink away regular attacks from Einherjar mobs, then they just need to gtfo. Third Eye is your friend there, bros.
So WARs and DRKs sub /SAM ... and /SAMs sub /WAR or /DRG and take your chances.
Leave /NIN to the THF (lolFeint?), PLD (though /RDM could arguably be better there too), and any other ragtag melee job that happens to be lucky enough to come along to Einherjar with you.
Although, I must admit that it's fun to point out that /NIN would have been better for Slimes after getting owned by them, just to rile up the people in LS who like to tell everyone how smart they are. :D
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