Why did Roux add in OP's trial affi that he spoke with RS on his way to retrieve the fan/s? Putting her in the bed at that time helps OP, but proving he knew she was awake within a minute or two of shooting her dead seems worse for him than him thinking she was asleep and nowhere near the toilet.
Simple.
Based on OP's affidavit, if one witness comes forward claiming Reeva spoke one word or made one sound after 10 pm, OP is guilty.
By saying he spoke with Reeva shortly before getting the fans, he now creates a scenario in case people testify to hearing Reeva before he killed her. Possibly the live-in gardener or another witness is going to testify that he heard Reeva and OP talking about making wedding plans at 3:10 am.