Uhh this isn't right, there was never a see-invis guard at the WFP gate that wandered.
If you look at the comments here it says:
"Only one guard sees invis in WFP."
Seeing as Guard Fikus is the only guy listed on Allakhazam's status page as being see invis, that's the only guy that should see invis. He's inside the militia building away from the gate. You shouldn't have evil factions getting killed at the gate by Ledshin aggro'ing. The commentors for Ledshin are flatout wrong.