In my TFP AU, the Star Saber and the Matrix of Leadership were two parts of a single powerful relic that became separated long ago. The Aligned continuity itself appeared to hint at these two relics being once one thing, from the concept art of Prima holding the Star Saber with a very obvious matrix in it's hilt, to the designs of both the Star Saber and the Matrix used in Transformers Prime. The design of the Star Saber's hilt just seemed to scream 'insert Matrix here' to me...so I did…
Kaan Mustafa