How dare you?!?! Block, ignore and downvote...actually this is not reddit, so let me just reply instead.
I'll never consider valid arguments as attack.
Guilty as charged. Heavily prejudiced towards Templars, and that definitely clouds how I see Linnae.
As I mentioned in another comment, I don't consider all templars bad, and I definitely think organization is needed as such.
But yes, I am sceptic as hell when it comes to Linnae. She is just too nice.
For possible traitors...others are just, well, too incompetent to be traitors.
That could be intentional of course, to make them less likely, but don't think so.
Steroid Kevin was mentioned as possible, and that could also make sense (bar scene where he keeps looking at MC), but he would only follow orders from someone else. And again, I see Linnae in that role.
How do you, Benchmark incompetent? (sorry english in not my native lang.) I mean how do you asses, competence in the given situation what is the scale ?
In the situation where the Grandmaster, was abducted, and they had to negotiate, those who took a proactive aproach, were Linnae, Mary, and Jason (William) Philip was more like "oh he is being held hostage, well we have to see what we do...."
William, wanted to start a war, (not very competent nor diplomatic) but at least he tried to do something, (that is why I said he is proactive) Linnae , started to prepare worst case scenario, (trying to recruit someone in the line of the grandmaster, MC), Mary supported her, that the MC run into the squirmish with he hellspawn, no one knew about it, but that wouldn't had happend if Linnae didn't order Kaija to show MC the ropes, in Neverwhere.
What make Philip suspect ? from my angle
1. he is not soo engaged in coming up for a solution as his superior is taken hostage.
2. how he behaved with the sword Durendal, he wanted to give it to MC but didn't tell him about its power nor significance,
he wanted to get a hold of the sword, as well William wanted, anyway if MC keeps the sword it will be much easier to take it back by force as when William has it, (MC is not so skilled in fencing and has no military training, William on the other hand has it.)
3. As chief of the finacial operations, he is the one with connections to manouver MC into the ambush, by pressuring his superiors in the Insurance company how it happend or knowing the decision takers of it.