Well you have your answer there, don't you?
He's (at least) a half and half.
Without the pedigree it's impossible to know whether the Dam has any worker lines in her pedigree and likewise the Sire may have show in his....
I'm not sure what you mean by "he is a 5 generation" - all pups have 5 (and more) generations before them!! As he's not KC registered, I take it you have no copy of his pedigree (which is what would normally be referred to as the 5 Generation thing - you get a certificate naming all ancestors going back 5 generations!).
I suggest you read up on the many threads there have been about working cockers and their needs. We found forewarned was forearmed with Honey, and taking proactive steps in the early days to keep her mentally stimulated has saved us a lot of stress as time has gone by....
Is the Sire actually worked? How driven is he? This might give you a clue as to the potential energy levels of your little guy!

(posted at the same time as Jeanette!)