Are there any mineralogists out there that can shed some light on Ni / Fe substitution in pyrrhotite ?

I've seen some wild projections in the forums (here and SH) of 1% + Ni.  I've tried looking and can't seem to find much info.  I known there was reference to Ni in the NR but I just can't see it based on the mineralogy they mentioned in the NR.

I've looked back at the 2006 SPQ/FWR NR on their chrome layer that they hit and there was only minimal Ni (0.17% ).  Their 3rd hole intersected massive pyrrhotite (see below) but they only reported low Cu values (no Ni at all) 

following from SPQ NR of March 7,2006

 Hole FW-06-04 intersected several sulphide rich zones including 0.74m of massive pyrrhotite at 128-128.74 and again at 132.38-132.85. There are two main sulphide rich zones of approximately 9 meters each with 10-20% pyrite/pyrrhotite both in seams and disseminated. ..The two sulphide zones explain the conductor and magnetic target. Anomalous copper values were received from samples selected from 120.6 to 141.5 ranging from 0.119 % Copper to 0.421 % copper..