Then you greed it and ask if you can have the item, very simple. The use of need should be reserved for the specific class that can use the item
You aren't understanding the specific issue he's talking about. The marauder can use all the mods on the item, so the only difference between the marauder and the dps jugg is that the jugg can use the shell while the marauder cannot. In this case giving the jugg priority essentially means that the jugg "needs" the empty shell. As empty orange shells are very easy to obtain, it would be ridiculous to roll need on them.