This might seem like a dumb question, I'm pretty new to the contest scene... Is it necessary to have multiples of the same return top when it comes to competing if it so happens you have to switch out? I see a lot of people with 2-3 extra of the same yoyo when they compete.
It's not "necessary", but a lot of top level players will find a specific return top that suits them, and then make sure they have backups of that one, all set up identically. It's a consistency thing...if you don't have to adjust for a change in equipment, you can focus on just your tricks without needing to make allowances for picking up a different return top.