[quote=@ColourlessKing]
<Snipped quote by VitaVitaAR>
Oh that guy. Why not use Nameless he is basically a nicer version that has no regrets and can summon Excalibur huehuehue. 
[/quote]

Normal EMIYA can trace Excalibur as well (he threatens to do against Saber as a mutual assured destruction tactic in UBW, after all), it's just that doing so would kill him right after from the exertion.

The only reason Nameless can use Excalibur Image without killing himself is that he's in the Mooncell, so that wouldn't apply here anyway.