They aren't "decent" squad players. They are examples of a club who have lowered their standards, who don't put any money in to the squad.
Hedges is an attacking player who plays almost every game and has mustered 1 goal and 2 assists. He offers nothing going forward, he doesn't score, he isn't creative, he isn't quick, he isn't tricky, he doesn't beat players.
Forshaw is a veteran who Plymouth happily gave away. When he started games or played a big chunk of games, think Oxford away, Bristol City away, Stoke away, Swansea away, we really struggled. Not obviously all down to him, but he isn't good enough aside from coming on occasionally for a few minutes to help see out a game. Which is all well and good, but he will need to start games when starters are unavailable.
It's this idea of, oh he will do as a squad player. Then when we get a few injuries and have to play these players from the start regularly, the performance levels dip and the results suffer.