Today's topic involves learning many styles versus spending all or most of your training in a single style.
Some would claim that cross training is necessary as there is no such thing as a "complete" style and that to get in decent ground work, throws, striking and kicking, locks, etc., you need to train in a variety of styles.
Others would claim that being a "jack of all trades" makes you a master of none - that spending your time getting into the deep understanding of a single style and being able to execute its strategy without thinking is the better way to go.
So what do you think?
Is cross training necessary, or is it better to study a single style only?