So if a mage if light knows knowledge and true information wouldn’t that mean a mage of light knows ALL the information about almost everything as long as it’s available to them (since the unknown is for the void players) also a mage of ligh would know the probability of outcomes ?

Rose as a Seer of Light knows the ‘Alpha’ way of doing things, what’s Relevant and needs to be done. She also learns everything there is to learn about SBURB, so yes, a Mage’s powers could similarly allow them to know a good deal of just about everything relevant. Much like how Doc Scratch is nigh-omniscient but there’s still dark spots that elude him, and can simply speculate about certain non-relevant outcomes.

The probability of outcomes may be more tied to Mind.