It seems to me that, when watching the Generation 1 film, Prime stated "Soon, I shall be one with the Matrix." As it was later revealed, the Matrix was where the wisdom of ancient Autobots was contained to bring strength and guidance to the current Prime. His statement, however, could have lead to the confusion between the Allspark and the Matrix, which are obviously two totally different things. The Beast Wars writers must have assumed that, since the Matrix is a piece of Primus, and the Allspark is Primus's collective spark, that the Matrix was another name for the Allspark. Of course, there was no evidence to support that all Autobots transcended to the "Matrix," since Prime had only indicated that he himself would join the Matrix. In an attempt to add depth to the series, as we all know, the Beast Wars team did indeed invent the concept of the spark well AFTER Generation 1, but one can see where the confusion lies in retrospect. It is such that I feel that the fandom should recognize the "Matrix," as singularily the item of power which becomes fused with the spark of the Prime, and the "Allspark," is the Well of Sparks, and the originator/afterlife of the Transformers, and not get the two confused at all.