Why are you trusting the Templars to be competent scholars and to deliver relevant information to us? A generation ago they were on board with killing all Imperial magisters, just because we are on the same side against Chaos and vampires does not mean they trust us with tomes of dark magic or frankly that we should trust them.
I don't expect them to give us the information, I expect them to give it to the appropiate person/people when it's needed, as they did with everything involving Alberich. The Templars are bound to collaborate with the Colleges, independently of our not-very-warm relations.
I would also be fine with keeping the scrolls ourselves, but I think if there is really important knowledge that could be used against the enemies of Civilization, the Templars are probably better suited to ensure that it reaches whoever needs it than Mathilde is. There's already precedent, with a Grand Theogonist using the Second Secret of Dhar to destroy IIRC Mannfred's army.