Quote Originally Posted by Hursticon View Post
Ooh! - Now, I like this.
So every recipient would essentially hand over their spark to the Matrix upon receiving it yeah? and hence the upgrade?
Correct.

There's only meant to be one Prime at a time, as far as I know, thus there is only one spark in the canister at a time, as a dying Prime (IE Optimus in TF:TM) hands the canister on as their spark rejoins the Allspark for good, and the new power up comes when a new Spark is 'chosen' by Primus (IE Hot Rod in TF:TM)