Aleister never implanted Imagine Breaker on to Touma. He simply had the original container for it, the severed mummified hand of a Saint, in his possession during his Golden Dawn days and used it to kill Mathers at the cost of destroying it.
From there, he bid his time waiting for when Imagine Breaker would resurface again and Touma was then born and revealed to be the new container for it
But this is all a total derailment so fuck it
From there, he bid his time waiting for when Imagine Breaker would resurface again and Touma was then born and revealed to be the new container for it
But this is all a total derailment so fuck it