Theres no reason too because its already leak free, you're just returning a value poiting to a player. If you're using it as a local variable then you can nullify it at the end, but if its a global then you don't need to do anything.
If you're just going to nullify it all you have to do is custom script: 'set varname = null'
Ghan has said he has fixed this. Monovertex please confirm this fix. This was only a problem with people that had signatures in the upper levels like not the special members but the respected members.