Some training camp reports mean more than others. KeeSean Johnson in Arizona and the Butler fellow in New Orleans, just my opinion carry more weight than Singletary getting work in Buffalo. Could very well be the case of McCoy and Gore, both over 30, needing rest more than practice reps. They know how to get themselves ready for real football and need no evaluation either.
As far as Singletary looking totally awesome, grain of salt perhaps. There are very few opinions of drafted rookies looking terrible, thus such reports have more meaning than the routine "rookie looks good". While I'm about ready to give up on Rosen, I think it's a little early to move the needle on Singletary. I can't wait to watch him in pre-season though.