A day earlier, second-year offensive lineman Kelly Butler was playing offensive guard. On Saturday, he was at tackle.
On Friday, receiver Mike Williams was a third-team receiver, and after concerns that he reported to camp overweight, many in the media questioned whether he could climb up the depth chart. Saturday morning, after veteran Corey Bradford left practice due to cramps, Williams found himself beside Roy Williams -- with the first team.
The constant movement of players within the first 48 hours of "Camp Marinelli" is due to a few things: Strategy. Motivational. But overall? Lions' head coach Rod Marinelli is simply attempting to keep legs fresh.
"Right now, with the amount of running we're doing, you've got to be smart so you just dont wear somebody down totally," said Marinelli, who urged many not to read into line-up changes as anything significant. "We've had an opportunity to go out and look at guys doing different things, different routes and all of those things.
"It's different for health issues, too."
With six players on the Physically-Unable-To-Perform (PUP) list (and each due to return relatively soon), nothing is set in stone. In fact, Marinelli would rather any discussion of a depth chart be dismissed.
"It's practice," he said, "If you look at the linebackers and the line, we're rotating guys through there quite a bit. It doesn't mean much other than a chance to look and maybe give the other guy a 'blow' a little bit."
The Lions still have two more weeks until the team's first preseason game, and even those early exhibition games are still used for evaluating purposes.
Detroit's roster won't start to take shape until August 29, when the league mandates that a team's active roster must consist of no more than 75 players.