[Specialagentjim]

Personally, I think it will be a combination of a Collector robot and a Capper/hanger.

I'm envisioning a team that:
Robot A- Collects and distributes balls between human players on alliance and fills stationary goal
Robot B- Caps goal
Robot A- Finshes dropping off balls for alliance HPs to fill stationary goal
Robot A- Moves to Hang if the ability is present / Defend against hangers
Robot B- Hangs

Something like that.

On the defensive note: We've played some great D when our robot has had things break. I find its a good strategy when you've got a good alliance partner and your going against a team that has one good robot and one not-so-good robot. You defend against the good one, then it becomes your alliance partner vs. theirs. Not always the best situation in the world for all matches, but when that match comes around where that works, it sure does work!