Too many injuries no continuity a very good side on the right day. This is what makes the upcoming finals series so interesting any team could realistically knock off one another early on and it would't be a huge upset.
I'm not totally subscribed on the injury "crisis" theory. We have 5 best 22 out at the minute off the top of my head - so it's not exactly a major issue, and we're likely to get em back for week 1.
And because of they way the Pies play continuity is not a huge issue either, they are very difficult to defeat when they bring the heat - it's not personnel reliant. Being predictable to the opposition is irrelevant also because of the swarm and structure up with and without the ball, it allows them easy transition. It's tactically brilliant.
When they're on you have to out transition them of course after out contesting them at the coalface. That's very difficult to do and only the very best skilled teams can beat it - if they're good enough to win the contested ball also.
If you look at the essendon game last night all the metrics were won by the pies apart from tackles. If anything the score line flattered a very brave essendon outfit.
In short injuries and continuity aren't a major concern for mine.