I loved Kramer as a Boiler, but I don't think he's in Allen's league defensively (no pun intended); not many are. Allen was 1st Team All-Defense this year, and he is one of the best (if not the best) wing defenders at his position. That will get you a spot with a team for sure. He's also good in transition. Even with that, his offensive game ended up being a liability for Memphis. At times, Golden State used Bogut to cover him (if you can believe that) allowing Bogut to patrol the paint later in that series. Part of the issue may have been Allen's lingering hamstring injury.
I think if Kramer had more offense to his game, he might have found a spot as a reserve somewhere. The NBA has changed a little bit over the last couple of decades on this. Years ago, guys like Kramer had a better shot to have a roster spot. JMHO