Firstly, the arc of the beloved character has not ended with the show's finale as opposed to other members of the original cast who either retired, found a new job, or even died throughout the course of the show. In the finale, the only two remaining members of the original season 1 team were Matthew Gray Gubler and A.J. Cook playing Jennifer Jareau. JJ returning to the reboot actually reminds the show's fans about the unfinished business between her and Reid.

In the finale of season 14, while being held at gunpoint by an unsub JJ confessed that she had always loved Reid. And though this confession led to nothing in season 15, fans wonder if the reboot could spark the romantic feelings between the couple.

With that in mind, it could be difficult to explain the absence of the boy genius without some forced cooked-up story. Reid has never left the BAU, even after some pretty traumatic events in his personal life and career.

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