The most glaring weakness on this team is the depth at small forward. Chris Forsberg sums it up nicely.
Behind Paul Pierce, Daniels is essentially the only other true small forward on Boston's roster (not including Tony Gaffney, who could still win a job at camp). An injury to Daniels forces the Celtics to jam a square peg in a round hole by shuffling the likes of Von Wafer or Luke Harangody to the 3 (though Harangody will likely get a chance to show he can handle that spot thanks to a roster log-jam in the frontcourt, particularly once Kendrick Perkins is healthy).
That is reason for a little bit of concern, especially when you factor in Paul's age and propensity to miss a few weeks at a time each year.
With that said, is sure is nice to have the 3rd string small forward be the primary concern heading into training camp.