There are still 4 Beatles

The news that Paul and Ringo may perform got me to thinking; how many Beatles are still with us? That is, guys who were IN the Beatles at one time or another; not 'guest' artists like George Martin on piano, not members of the Quarrymen, Silver Beetles, etc, etc. Just honest-to-goodness Beatles.
I think there are four;
Ringo (drums)
Paul (bass, etc)
Pete Best (drums)
and...
Chas Newby!
Who played bass four times with The Beatles between Stu Sutcliffe leaving and Paul taking over on bass!
So, technically, there are four Beatles, and, while it would be a real bass'n'drums treat, it may not be what the world wants. Even though the idea of four Beatles taking to the stage this summer does make the heart beat a little faster!