I don't know if he is a lock to make the team but there are things definitely working in his favor.
Yakemchuk could do double duty on the PP and PK, which is a rare profile among the group.
Bonk or Dickinson did not run London's PP. Bonk was often the bumper(strange configuration) and Dickinson was the trigger man (a la Norris), when he was on the first unit . They ran forwards as the traditional PP quarterback.
There is obviously Parekh, who certainly represents a real threat to Yakemchuk in securing one of the PP spots. They were both quarterbacks on their respective units and are the only real D-man options as difference makers in leading a PP from the top, although it is feasible the team could go in a completely different direction and run a forward at that position.
Yakemchuk, especially toward the end of the season, was first unit PK . He does quite well in the this context when the game is simplified, with net clearing, physicality and puck battles gaining in importance.
The other element that separates him, which was just mentioned, is his physicality/nastiness. He has a set of dimensions to his game that will definitely make him an attractive option to the team
There are also things working against him. I don't know if the team can carry both Parehk and Yakemchuk. It would be too risky. It may be too much riverboat gambler for lineup to handle.
Some of the other options at RD that have size and/or physicality that may be the safer bet, like Sotheran, Mckinnon, and Gibson.
My prediction is Yakemchuk beats out Parehk for a spot. However, I would not be surprised if Yakemchuk is an odd man out.