Yes. And Yes.
Look, there is no chart that measures who the greatest RB in the NFL is/was. Cases can be made. You can't say for sure either way because there is no way to prove it. That's obvious. To me however he is, that's just my opinion. And whether he's the best of all time or 2nd best or even "just" in the top 5 doesn't matter, that doesn't mean we shouldn't bring him in. I'll take Adrian in his prime over Sanders, Brown or Dickerson. And by the way, he's 29 AND he's had a year off. Nothing would suggest / prove that he's lost a step or anything like that, we haven't seen anything that would suggest that. I think he'll come back this year and be the same exact guy that almost broke the rushing record. Not for long of course. But I think he's got at least 2 elite years left in the tank. By the way, I doubt Murray has much more than 2 elite years left, he's not exactly a spring chicken either at age 27 if you consider how many touches he's had and his injury history.