I completely agree @Stevetank . I put out a number of roles, but most of them can be rolled up into one or two people for a small group. The reason I put so many roles is so that if groups get really big, you can split out roles and responsibilities and not have one person be responsible for everything and end up having stuff fall through the cracks because they have too much up in the air at the critical times.
Insisting on a specific ship mix will also not work at this stage. We don't know what each ship can do. What we think may not be what actually is.
