Our new friend dropped in weeks ago. [She's not saying there isn't a line to be drawn from point A to point B, just that it's possibly a too convenient one.] It could be anything - tech failure, maybe another company bought the contract on the planet. [Which is speculation, but no more so than Parker's theory.] If it was a personnel issue, why wouldn't they just deal with the individuals?

[Because there's sure as hell a history of that. But at it's most basic there's no heat or edge to what Shepard says as she collapses the legs of the bench, folds it up into its compartment with Parker's help and secures it there. No way to refine an idea without someone asking you to defend it, right?]