What's the Flyers' biggest weakness right now?

Here are the Flyers in the defensive zone. No, I did not choose a picture of Andrew MacDonald on purpose, I swear. - Russell LaBounty-USA TODAY SportsThere's not a whole lot that the Flyers have done poorly in recent weeks. Is there anything in particular we need to be concerned with as the Flyers head down the stretch and hopefully into the playoffs?

An interesting tweet popped up on my timeline on Tuesday afternoon:

For those of you unaware, Micah (on Twitter as well as over at his excellent website hockeyviz.com) is one of the best folks out there at taking hockey data and putting into visually appealing form. From single-game pictures to season-long trends for player or team, he does a…