Nelson, Duffy, and McGehee have played their way on the roster for sure. Gwynn and Nixon haven't done anything to show they deserve a roster spot. Gwynn actually hasn't done anything at all. Considering Counsell is a lock for one back-up infielder spot, there are 10 locks so far (8 starters, Counsell, & Rivera). Duffy is adequate to cover CF, Nelson is adequate to cover LF, RF, and 1B, Counsell for SS, 2nd, or 3rd; and McGehee for 3rd (Although I heard he played a bit of 2nd cbase recently), and Rivera obviously is the back up catcher. So if Macha wants to carry 13 position players, Nelson, Duffy, and McGehee have to be the 3 front runners. If he only carries 12 I think McGehee is the odd man out since we already have Counsell to cover 3rd.