That one guy is Phoenix's Voitto Stromberg, who was out with a strained groin last week (listed to return in one week), and is now listed as "unknown" per the html reports.
The complaint generally leveled on injuries that go to "unknown" (and DTD injuries) is that they aren't realistic. However, it's not unusual at all for a person with a strained muscle to be literally on a day-to-day basis before he can come off the DL...which is what "unknown" essentially translates into. I mean, this happens ALL THE TIME with MLB players.
My guess here is that Stromberg will be ready to play in a few days. If that happens, then I'd argue this approach was as "realistic"...whatever that is. It at least passes the gut check for me.