Whitmore is available, but this is unlikely to impact fantasy basketball. He hasn't been in the rotation and has even spent some time in the G League recently. There's no need to roster Whitmore in redraft leagues.
Brooks and Eason are on the injury report for the same reason, and both sitting would put the Rockets in a difficult spot regarding perimeter depth. Amen Thompson is the player most likely to move into the starting lineup if Brooks and Eason sit, while Cam Whitmore could sneak into the back end of the rotation.