Erskine was injured. Combined with Hillen's injury and (apparently) the coaching staff's lack of enthusiasm about Oleksy's play on his off-side, this meant a LHD needed to be recalled. Both Orlov and Schmidt have a higher salary than Carrick, so sending Carrick to Hershey doesn't clear enough salary to remain under the cap. Thus why Latta was sent down as well.
Pretty simple when it all comes down to it.
This, the organization was already utilizing performance bonus cushion space and LTIR to recall Latta and have the 23 players on the roster.
Wilson, Carrick, Latta, Urbom, Orlov, Schmidt all have performance bonuses in their contracts; all are waiver-exempt and of course, Wilson can't be sent to the AHL. So if you remove one of them from the Caps roster you also have to look at it from AAV and the cushion. By my math, Carrick and Latta's hits are low enough, a second player had to go down.
Caps are at home for the next few games. Carrick sat last game, too.
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As to Orlov, the eye issue was reported yesterday before the Caps game.