Tell you what I like about Stoll's upper body lock. His arms are sufficiently long that often he can lock up, but his opponent either can't return the favor because of a size mismatch (which I think was often the case last night) or doesn't want to because of Stoll's superior Greco skills. As a result, when Stoll locked up Smith, I thought there was no risk that Smith would be able to put Stoll in any jeopardy. It was all upside for Stoll, and we all know he has a variety of throws and trips that he can deploy from that position.
My two cents on the stall call: Not stalling. When Stoll has an opponent locked up, he has every reason to push an opponent who starts to back up to the edge of the mat. The way that Stoll can most effectively score off of a lock up is by pushing the opponent into a more vertical type of stance, where Stoll can throw or trip the opponent. With an opponent backing up like Smith, Stoll has no choice but to push the opponent to the edge of the mat and force the opponent either to go out of bounds or to stop retreating and to risk getting thrown or tripped. A stall call on Stoll? Not seeing it. You're penalizing the wrestler who's creating all of the action. The referee needs to put an opponent like Smith to the choice of having a stall warning called against him or standing straight up and getting launched into the atmosphere.