The question is not if there is evidence pointed towards Oswald as Tippit's killer, because there clearly is. Highly circumstantial and heavy relaint on often unreliable witness testimony, but it's still evidence!
The real question would have to be IMO if that evidence is compelling and persuasive enough to provide conclusive proof of Oswald's guilt in Tippit's killing. And that's where opinions differ and where, in my opinion, the case quickly falls apart.