Forward and DiTillio thought that the Matrix was nothing more than a vessel for Prime's Matrix. So it's really the Spark of a power G1 TF in the body of a BW TF = upgrade. Remember that the same thing happened to BW Megatron when he placed the Spark of G1 Megatron inside his body - he was mutated into his Transmetal 2 dragon form, and G1 Megatron is certainly no Prime nor a Matrix bearer. As the BW writers explained, it's because they wanted to make the G1 Transformers seem like gods/titans in the eyes of the BW TFs, so the idea of a "mere mortal" BW TF placing a mighty G1 TF's Spark inside their body would mean a massive boost. Although the show did say that there's great risk as the surge could very likely destroy the host Spark. Both Optimus Primal and BW Megatron risked Spark-death when they placed their G1 namesakes' Sparks in their bodies. Primal did it because there was no choice; Optimus Prime's Spark would have perished had it remained in his damaged body - Primal had to temporarily carry the Spark so that his body could sustain it while Rhinox initiated repairs. BW Megatron took the risk because he felt that it was worth the benefits of having a powerful body like Optimal Optimus. None of it had anything to do with the Matrix, and the writers have admitted since that they misunderstood what the Matrix was when they watched TFTM.
Oh right... the multiversal singularity thing which never existed when G1 or BW were written.![]()
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