SA owns Agent Jobs but is Disabled

Many of our Sql Server Agent jobs (2008 r2)  are Owned by SA. This has never presented any challenges and jobs run fine. I just noticed that the SA account is "Disabled" but still owns jobs which are running.  I don't remember disabling the account, and I don't remember it being disabled but there are other admins which could have done it.  Who knows.  SA has a very hard password so I am not worried about a break-in.

I would like to know if having SA disabled may cause any issues, especially with SQL Agent Jobs. 

Thanks