My take was a slightly strange one, but it is stuck in my head:
The Tremere think of themselves as the military of the order. They are soldiers . But they are also a latin house and learned men and women. Under those circumstances, it makes sense to me that they would have learned the lessons of the Roman legions: that discipline is more important than bravery, drill wins more battles than skill and logistics wins wars.
So, to me it makes sense that the Tremere know that house Flambeau, for example, are great champions of personal combat and not expect to fight one successfully one on one. But the Tremere don't fight a threat with a single Tremere when ten could do the job with no risk and greater certainty. Other houses have hoplites in times of crisis, but in my head, I can see the Tremere deploying phalanxes. After all, it is annoying to have to take a few days out of your learning to be magically flown to a trouble spot, crush the trouble, and be flown back, but it brings the comfort of knowing when you break then enchanted object that allows you to send a message up the chain of command for support, that the cavalry is definitely coming.
The way a military wins wars is by having well-ordered, well-equipped, and fed men in the right place, used to working together and under a known leadership who can be wielded to win the conflict. House Tremer takes this to mean it should be able to gather its members at short notice, inform them of difficulty, and have them already know their place in the functioning maching of Tremere efficiency.
But all of that logistics is expensive. They need to have some people who are supplying all the means to bring the house into a terrifying juggernaut of conflict. So there must logically be Tremere whose job it is to set up waystations, places to heal the sick and make enchanted items. Places to teach those who need new skills and muster troops before the big push. Places for those on a campaign to fall back to in an emergency and find a possibly short-lived but mighty line of defense to reorganise in. To be an army means having a support corps. I was going to pitch one of those Tremere who has been sent on a long term mission to build the covenant up full of resources and useful things, both to prove the superiority of the Tremere way (tm) and if another sundering crisis came up to be a forward operating base for the main thrust of the fight.
He would have had enough magic to be useful in a fight if not a dedicated fighter (I as looking at a mastered PeCo spell, with some penetration skill, fast cast, and penetration masteries) but that is mostly because everyone should be able to fight in a difficult circumstance. Other than that he was here to build a flourishing supply base for house Tremere, by building a flourishing covenant that could be converted at short notice in a crisis.
I am aware this is a slightly non-standard reading, but it is one that makes sense in my head of a Tremere who are trying to be the army of the order by emulating the glory that was Rome, and hence being more like a legion than a modern feudal army.