It does seem unusual. I wonder if that will become the norm in the tank mode system the Cubs have inspired. A select few teams get really aggressive while several choose to suck and then variance with all the rest.
Warren started a game in Iowa on the 25th and went 3 2/3 with 59 pitches thrown. Considering he is meant to start a game here soon, I would think they'd prefer he get another start tomorrow, on 4 days rest and goes 75+ pitches.