Well, think about it for a minute. Brett Swain was on the roster as a WR, but he really only played on special teams (he was thrown to 9 times and caught 6 balls, counting playoffs). Would it really be that different if we were to draft one of these guys (who were WRs in college) and have them take Swain's job, except instead of covering kicks he returns them?
So I think what Thompson is saying that anybody we draft, they will have another position, and they'd learn that position and they would work out with those guys, but it's not as though we don't keep people around whose primary contributions and roles are on special teams.