From the c# bootcamp I know it's a little outdated but still relative but from the animation clip tutorial there from what I picked up it seemed like legacy animation was for one use and if there were multiple animations mecanim were used. I am I correct or did I get that lesson wrong?
Mecanim and the Legacy animation system can both support multiple animations. Mecanim is what should be used for anything animation related. I believe you can still use the Legacy system but Mecanim is far better overall. With Legacy animations you essentially have to manually script out all the same features Mecanim would provide.