A bit of info from a team member would be helpful. Being concerned about Steve's well-being is not helped through a lack of knowledge.
I see no logical reason for a transfer not taking place during the day, if that is what Steve wants. He has already said how much he enjoys night riding. Having said that, today's weather in SE England was so mild* that I for one would have expected Steve to make the most of it.
*So mild, in fact, that I was cycling around London in my shirt sleeves - a short-sleeved shirt.