After the events of ST09 wrap up, wouldn't it be logical for Old Spock to try to return to his time? I haven't watched the movies in awhile, but was there ever an explanation as to why he continued to be an out-of-time interloper meddling in the past? Surely getting Back to the Future would be within his abilities. Additionally, I would think that with the destruction of Romulus, his role as an ambassador and proponent of unification ( + = ) would be more important to him to continue in the 24th century. Thoughts?