Hey Darkemor I felt the same way starting our chronicle. Our group took a cue from the Marvel cinematic universe, and had the PCs meet, compete, fight, and work out their differences until a greater threat caused them to band together. As organic goes, they finally formed a cabal at the end of the second story arc. (No easy task given 3 Guardians, a Mystagogue, Libertine, and a Nameless) It didn't feel rushed, and the length of time allowed character development and more authentic relationships between the mages.

Some ideas:
1) Draw them to a common Mystery
Mages chase...