Why wouldn't Flower be given a number?
As for the squad overall, it does look very strong. There is a lot of experience as well as the talented youth really being given a first team run out this year.
Williams at 6 is the stand out selection and I think he's got the shirt due to his pace. Hampshire will be playing at full back quite a lot I feel in 2015 as a run in for him getting the 1 shirt next year.
Every part of the squad has pace together with size, skill, aggression and game knowledge.
We've quite a formidable outfit in 2015 and I can see them competeing for silverware throughout.