Your diagram of the courses that Californian could have taken after crossing the ice up north is not supported by the available evidence.
8871. Did you see the nature of the ice, between six o’clock and 8.30, the next morning? - Yes.
8872. While you were steaming in the direction of where you supposed the “Titanic” to be? - Yes.
8873. Do you remember what course you had to steer? - No.
8874. Were you able to proceed direct to the position of the “Titanic” given by the “Virginian,” or had you to skirt the edge of the ice-field? -
We went along the edge of the ice-field, I remember that.
It seems to me that once she cleared the ice up north around 6am Californian headed down the western edge of the ice toward the Mount Temple. If Moore saw Californian crossing the ice, as claimed, then Californian had to have seen Mount Temple to her south. According to Stone, there were only three vessels in sight that morning when he came on deck. He didn't name them, but we know that there was Mount Temple (yellow funnel),
Carpathia (red funnel with black bands) and this small 2-masted steamer (black funnel with white band).