What exactly is your canon source for the date that Pike's command of the 1701 ended? And all that's known about Christine Chapel's previous 'posting' from TOS S1 - "What Are Little Girls Made Of" is: http://www.chakoteya.net/StarTrek/10.htm Hell, in TNG Beverly Crusher was promoted to the head of Starfleet Medical after one year on the 1701-D. One year later, she relinquished that post, and re-signed as the CMO aboard the 1701-D. So yeah, sorry - nothing so far really contradicts any canon sources WRT Christine Chapel and what her posting was in 2259 (7 years before she returned to the 1701). Hell, it appears from the character Trailer she's DOING bio-research on security chief La'an. Which only re-enforces they are aware of her 'future history'.