Here are the blue shoes again, picture taken from RM's twitterfeed. I's say the colour coordination is perfect, the blue of the T-shirt does not clash with the shoes.
IMHO the man that the police seek to identify is not Richard Morris. The man in the video is wearing a T-shirt and RM was wearing a blue
long-sleeved top with a half zip, which is a totally different garment. You cannot roll up those sleeves to make them look like the short sleeves of a T-shirt.
In the pictures that I have seen, RM is wearing similar short running shorts and the shorts of this man are almost knee-length.
Another picture from his twitter feed: lots of leg even in the snow (and a half-zip with long sleeves):