Unfortunately, it's unlikely we'll have an injury free squad all season, but even when everyone is available, rotation is important.
A good example is Plymouth Argyle last season, who won their league with over 100 points. Ryan Hardie had a great season and played in most games, but rarely completed 90 minutes. They had four good forwards so they would start with two, go full tilt for maybe an hour, then replace them with two forwards from the bench without weakening the team.
The difference between yesterday and last season is we have guys coming off the bench who are going to at least maintain the standard of the team, whereas last season it was often just a case of throwing a body on to have 11 on the park.
Imagine having Gullan and Smith on either flank going full tilt for an hour then having the fresh legs of Ross and Connolly off the bench to replace them. Then the next game, vice versa.