Barbosa goes down, 3-man rotation is all you need, and Pierce can play SG too.
SF depth is one of my main concerns.
I am not sure which is more important to me. An extra guard or that third SF.
The third SF was a priority for me all season until Rondo went down. Now Sully has gone down too. Plus, there is Fab Melo. That is three empty roster spots. That is a pain.
We would've had great depth with five rotation caliber guards, two rotation caliber SFs and a third stringer and then 7 big men (well, 6 playable guys + Fab Melo). Protection / insurance all over the court. Take three roster spots away and things get tight.
They need at least more one rotation caliber big man preferably Kenyon Martin. That gives them 11 roster spots. Five bigs, two SFs and four guards.
Then you have the injury risk with Chris Wilcox (suddenly back down to 3 rotation bigs)+ the lack of SF depth behind Pierce / Green + the lack of guard depth behind rotation guys.
Three holes to fill and only one roster spot to do it.
I am not sure which one is the most important.
Someone in the Kris Joseph mold would be my preference, can play SF, and can fill in as a SG if needed.
If by guard you mean a PG, I think that would be a waste of roster space, other wise, a SF who can fill in as a SG would be preferable to me.