Those games are so small a sample size as to be irrelevant, and their hiring is part of a long-term plan.
They provide a nice convenient excuse though, for anyone who is looking for one.
On the other hand, one could point to the fact that Argyle contributed two-thirds of the central defenders in the Sky Bet League One Team of the Week (Gillesphey and Scarr) as evidence that the defensive coaching is strong...
(I suspect that Gillesphey's assist for Edwards's goal has helped him here).