[Jimmy K]

The rules say that each team may have up to 2 drivers (both students), up to 1 coach (that may be an adult), and up to 1 inbounder (student).

There isn't a rule saying any one team has to have an inbounder as long as the alliance has enough inbounders (from the other 2 teams) to handle the balls that are scored. Of course, not having the maximum 3 inbounders (one from each team) places the alliance at a disadvantage.

In fact, your team doesn't have to play with all four positions filled. As long as your team has at least 1 student show up to the match (even w/o a robot) your team is still eligible to receive qualifying points for the match. Although this puts your alliance at somewhat of a disadvantage, and your alliance partners may not be very happy with you.

In short, it is probably best to play with all four positions filled.